A. Package contents: You will receive 170 rubber gaskets, including 7 commonly used sizes. Among them, there are 50 pieces with a size of 9 mm/0.35 inches; 40 pieces with a size of 12 mm/0.47 inches; 30 pieces with a size of 16 mm/0.63 inches; 20 pieces with a size of 19 mm/0.75 inches; 10 pieces with a size of 24 mm/0.95 inches; 10 pieces with a size of 27 mm; and 10 pieces with a size of 30 mm/1.06 inches. It may meet your daily needs. B. Transparent independent storage box: These rubber gaskets are packed in a transparent storage box. The storage box has partitions, which can classify the rubber seals, making it convenient for storage and selection. C. Material features: The rubber seals are made of rubber materials, which are corrosion-resistant, heat-resistant, resistant to mineral oil, and wear-resistant. They have certain waterproof and electrical resistance properties and are not easily broken. They are soft and durable, and can fit and seal holes. The protective coils can also protect wires, playing the role of insulation and sealing. Since the middle is made of rubber material, you can drill holes to create the holes you need. It is suitable for sealing gasoline, diesel, lubricating oil, water, air, gas, and various chemicals. It is applicable to doors and windows, electrical appliances, bearings, pumps, rollers, valves, hydraulic and pneumatic equipment, key gaskets, industrial equipment, electrical appliances, computer server hardware, etc.