Twelve industrial rubber parts sort into three categories. User can do a 12 items sort, attending to the subtle individual differences between all the parts. Or, the concept of "category" can be introduced, with the four types of bushing, the four types of bumpers and the four types of grommets sorted into three catagories.

Includes 240 rubber parts, organizer and bins. Also included are step-by-step instructions, performance norms and data sheets.