The big "O" rings Multipurpose ring discontinued

I would definitely recommend this set of O-rings. It will include just about every size O-ring you could ever need. Sportsheets did an excellent job.

Variety pack, versatile uses and black.

Versital Low cost

I actually would recommend these o-rings. They're durable with very little stretch. With a variety of sizes these o-rings will fit the majority of toys.

Adds versatility to your harness, nice size range, sturdy, disposable