... rubber construction Built-in width This 382 piece set includes O-ring sizes ranging from 1/8" ID-1/4" OD ... " ID-2-1/8" OD. Each of these nitrile rubber O-rings features a built-in, easy-to-read width gauge ... : #006-012, #110-116, #210-222, #325-327 382 Piece O-Ring Assortment