What is a hollow strap-on? A hollow strap-on is a dildo with a cavity inside, held on the body by a harness. A wearer with a penis slides into the cavity and the dildo becomes an extension, adding length and girth. A wearer without a penis can use it like any strap-on, since the harness holds it in place either way. The Magnum has a 5.3 inch hollow section and a 3.6 inch solid silicone tip beyond it, which keeps the far end firm during deep strokes.
Magnum hollow strap-on: wear it over or wear it on
The Master Series Magnum is a hollow silicone dildo with its own harness. The dildo is 8.9 inches long overall with 7.2 inches insertable and a 2.1 inch widest diameter. Inside is a 5.3 inch hollow shaft, and the last 3.6 inches are solid, firm yet flexible silicone. The outside is a flesh-tone shaft with realistic veins and sculpted detail.
The vegan leather harness adjusts to waists from 33 to 47.5 inches, and a set of suspenders, adjustable from 28.75 to 56.4 inches, adds support for the weight of the dildo. The silicone is phthalate-free and the harness hardware is nickel-free.
Best for: For couples who want a large strap-on that works in two ways: worn over the penis as an extension, or used as a harness dildo for pegging. The 2.1 inch girth and 7.2 insertable inches are for receivers who enjoy big toys.
At a glance: 8.9 in overall · 5.3 in hollow shaft · 3.6 in solid tip · Waist 33 in to 47.5 in · Suspenders included
Key features
| Hollow shaft |
A 5.3 inch cavity fits over the wearer and extends them to the full length. |
| Solid tip |
The final 3.6 inches are solid silicone, so deep strokes stay steady. |
| Realistic detail |
Veins and sculpted texture give the flesh-tone shaft a natural look. |
| Adjustable harness |
Vegan leather straps fit waists from 33 to 47.5 inches. |
| Suspenders |
Shoulder straps share the weight so the harness does not slip down. |
| Two uses |
Works as a penis extension or as a strap-on for pegging. |
Specifications
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Dildo overall length: 8.9 in
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Dildo insertable length: 7.2 in
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Dildo widest insertable diameter: 2.1 in
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Hollow shaft insertion length: 5.3 in
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Solid tip: 3.6 in
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Harness waist: Adjusts 33 in to 47.5 in
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Crotch strap: 8.8 in (unstretched)
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Suspenders: Adjust 28.75 in to 56.4 in
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Materials: Silicone dildo; vegan leather, nylon, elastic and metal harness (phthalate-free, nickel-free)
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Color: Black and flesh
In the box
- Hollow silicone dildo
- Adjustable harness
- Suspenders
How to use
Loosen the harness straps and step in. Position the dildo at the front and tighten the waist until it is snug. Clip on the suspenders and adjust them so they take some of the weight. If you are wearing it as an extension, put a little water-based lubricant inside the hollow shaft and slide in before the final tightening. Apply plenty of water-based lubricant to the outside. Start slowly with your partner, as the dildo is long and 2.1 inches wide, and let them set the depth.
Care
- Use water-based lubricant only.
- Wash the dildo, inside and out, with warm water and toy cleaner after each use.
- Spot clean the harness and suspenders as needed.
- Pat dry, and let the hollow shaft air dry fully before storage.
- Store in a cool, dry place away from direct sunlight and apart from other toys.
More on materials in our material safety guide.
Frequently asked questions
Is it really 9 inches?
The measurements give 8.9 inches overall, with 7.2 inches insertable and a widest diameter of 2.1 inches. The name rounds the overall length up to 9 inches. The hollow section accounts for 5.3 inches of it.
Will the harness fit me?
The waist adjusts from 33 to 47.5 inches and the suspenders from 28.75 to 56.4 inches. The crotch strap is 8.8 inches unstretched. Measure your waist where you would wear the harness. If it is under 33 inches, the fit will be loose.
Can someone without a penis wear it?
Yes. The distributor says the harness fits men and women. Without a penis inside the hollow shaft, the base may feel less stable, so tighten the straps well and use the suspenders.
How much of the wearer fits inside?
The hollow section is 5.3 inches deep. The internal width is not given. Beyond the cavity, 3.6 inches of solid silicone make up the tip. Add a little water-based lubricant inside for comfort.
What lubricant should I use?
Water-based lubricant only, both inside the hollow shaft and on the outside. Silicone-based lubricant can damage the silicone dildo. Wash the dildo with warm water and toy cleaner afterwards, inside the cavity as well.
Strap on the Magnum
Add the Master Series Magnum 9 Inch Hollow Silicone Strap-On with Harness to your cart for plain packaging, privacy-safe billing and a mystery gift in every order.
For adult use only. Read the instruction manual before first use. Specifications are the manufacturer's.
