8 Neoprene Rubber Washers - Multi-Purpose Round Rubber Spacers - Rubber Bushings - 1" Outside Diameter - 3/8 Inside Diameter - 1/2 Thick. Durometer: 60 Shore A.

Good resistant to oil, heat ,cold, light, and oxidation.  Moderately resistant to ultraviolet light.  Resistant to weather, water, oils, greases and solvents.   Used for purposes like gaskets, vibration suppression.