Material used is neoprene (polychloroprene)
An item, made of rubber or plastic, usually cylindrical, with or without a flange, having one or more holes extending through its entire length, usually parallel to its axis. The overall length must exceed 25 percent of its diameter or a distance across the peripheral flats for items without a flange. For items formed of other material see bushing, sleeve. Excludes bumper, nonmetallic and grommet nonmetallic.
NSN 2925-01-218-0153
NSN 6145-01-052-7543
NSN 6685-01-031-3009
NSN 5925-01-415-9961
NSN 5998-00-232-2137
NSN 4140-01-359-2895
NSN 6650-01-397-8856
NSN 4140-00-936-0233
NSN 6110-01-465-1084
NSN 6220-01-142-7374
NSN 6620-00-172-9222
NSN 6320-00-238-9973