Rubber Anti-vibration Spacer, Pack of 4, 1" OD x 3/8" ID x 1" Thick. High quality rubber of Proprietary formulation for durability and performance. 50+ years of manufacturing expertise. "#1 Anti-vibration Products" TM. Use for anti-vibration applications, as a spacer, bushing, grommet, cushion, etc. 100% Made in the USA!