Amazon.com: JWBIZ 30 Pcs Metal O Rings Heavy-Duty Extra Thick 3.8mm Thickness for Sewing Keychains Belts and Dog Leash (1 inch, Silver) : Arts, Crafts & Sewing
50 1/8" I.D. 1/4" O.D. 1/16" Thick BUNA-N Rubber O-Ring: O Ring Seals: Amazon.com: Industrial & Scientific
Silicone O Ring 1 mm thickness White (x10) Ø8mm - Audiophonics