FLAT BLACK NYLON(Plastic)WASHERS Form A M2,2.5,3,M3.5,4 M5,6 M8,10,12 M14,16 M20 | eBay
100 Packs Rubber Flat Washers Heavy Duty Abrasion Resistant 3/4" OD X 1/4" ID X 1/8 Inch Thickness Black Neoprene Industrial Rubber Spacer: Amazon.com: Industrial & Scientific