Material: Made of rubber, with uniform wall thickness, strong tensile strength and good toughness. Color: Black Grommet Caps. The protective coil also protects the wires and also acts as an insulating gasket. 170pcs grommets blanking plugs in 7 sizes: 50 x 7.14mm, 40 x 9.53mm, 30pcs x 12.07mm, 20pcs x 15.88mm, 10pcs x 19.05mm, 10pcs x 22, 23mm, 10pcs x 25.40mm. Application: Electric gromit used for cylinder, valve, pump, electrical appliance, chemical pipe, vaporizer, water pipe, decoration. Come with a storage case, easy to carry and resealable.