Material: made of rubber, with uniform wall thickness, strong tensile strength and good toughness. Color: black eye plugs. 170 pieces 7 sizes eye plugs: 50 pieces x 7.14 mm, 40 pieces x 9.53 mm, 30 pieces x 12.07 mm, 20 pieces x 15.88mm, 10pcs x 19.05mm, 10pcs x 22.23mm, 10pcs x 25.40mm. The cable grommets are heat-resistant, oil-proof, wear-resistant and very comfortable practical to use. There is a thin rubber membrane in the middle that you can pierce to create your own opening. They are great for cars, cylinders, valves, pumps, electrical appliances, chemical hoses, sprays, water pipes, decoration etc. These rubber washers come in a divided container, which is very convenient for storage and collection.