Strap-On Harness Accessories, O-Rings & Dildo Attachments

Finish Off Your Strap-On Setup

Beyond the harness and dildo themselves, a handful of small accessories can meaningfully improve fit, stability, and sensation. This collection covers O-rings for dildo stabilization and base-mounted cushions built to add stimulation for the wearer.

O-Rings & Dildo Stabilizers

An O-ring holds a compatible dildo securely in the harness opening, and the right size depends on three things: the dildo's flared base diameter, the ring's inside diameter, and the harness opening itself. An O-ring that's too large won't hold the dildo securely, one too small won't accommodate the base at all. The Sportsheets Merge Collection Navy Rubber O-Ring 4-Pack lets you mix and match sizes and colors to stabilize a dildo's base, a simple, inexpensive way to fine-tune fit without buying a whole new harness. Some harnesses, like the KOOKIE Adjustable Low Rider, use a snap system built specifically for interchangeable O-rings (that one ships with a 1.75-inch ring), so check whether your own harness supports ring swaps before assuming one size fits all.

Cock Rings as Extra Harness Sizing Options

Most harnesses ship with just one fixed ring diameter, which can limit which dildos actually fit securely. The Spartacus Rubber Cock Ring (Set of 3) and Spartacus Metal Cock Ring Set each provide multiple ring diameters in one purchase, giving you additional sizing options to try against your harness and dildo base, useful if the stock ring that came with your harness doesn't hold your preferred dildo as securely as you'd like.

Grinding & Base Stimulation Accessories

The Bananapants line adds a genuinely distinct category: cushions and covers worn at the base of a dildo to create contact and stimulation for the wearer during strap-on play, a different purpose from O-rings or stabilizers entirely. The Shagger by Banana Pants is a dildo base cover built for a closer ride of connection and sensation. The Honeybunch by Banana Pants is a bumper and grinder worn at the base for solo or partnered play. The Lippi by Banana Pants is a crafted grinder, stroker, and dildo base stimulation cushion.

Strapless-Specific Accessories

If you own a Lovense Lapis, the Lovense Harness for Lapis holds it firmly in place for longer, hands-free sessions, an accessory built specifically for that strapless design, and functionally different from a traditional O-ring harness.

Accessory or New Harness?

An accessory is usually the better choice when your current harness is in good condition and you just need to accommodate a different dildo or improve stability. A new harness makes more sense when your current one no longer fits, the attachment system limits your dildo choices, or hardware is damaged. If you need a different harness entirely, browse All Strap-On Harnesses.

Frequently Asked Questions

What is an O-ring used for?

An O-ring stabilizes a dildo's base inside a harness. Interchangeable O-ring sets let you fine-tune fit or switch between differently sized dildos without replacing the whole harness.

How do I know what size O-ring I need?

Compare your dildo's flared base diameter to the O-ring's inside diameter and your harness's opening. Manufacturer compatibility information should always take priority over guessing based on labels like "small" or "large."

Are strap-on O-rings universal?

No. Sizing and attachment systems vary between harnesses, and even similar-looking rings can differ in actual dimensions. Never assume a ring from one harness will fit another without checking.

Can I use a cock ring as a harness O-ring?

Some players do, since cock ring sets provide multiple diameters in one purchase, useful if your harness's stock ring doesn't hold your preferred dildo as securely as you'd like. Always compare the ring's inside diameter to your dildo's base before relying on it.

What are the Bananapants accessories for?

The Shagger, Honeybunch, and Lippi are all base-mounted cushions or covers that create contact and stimulation for the wearer during strap-on play, a distinct category from O-rings.

Do I need a harness accessory if I'm buying my first strap-on?

Usually not. A complete strap-on kit is simpler for beginners since the primary components are already selected together, see our Strap-On Harness Kits collection.

Where can I buy strap-on harness accessories near me?

Bondesque carries harness and dildo accessories in our Minneapolis, MN store at 707 W. Lake Street, or shop online with nationwide shipping.

For more on choosing and fitting any style of strap-on harness, see our Ultimate Guide to Strap-On Harnesses.