This O-ring kit provides a comprehensive selection of metric-sized seals for a wide range of applications. Crafted from durable Buna-Nitrile (NBR) material with a 70A durometer, these seals offer reliable resistance to oils, fuels, and general wear. The assortment includes 32-different metric sizes, making it suitable for tasks involving faucets, automotive engines, hydraulic systems, and various mechanical equipment. For organization and convenience, each individual size is housed in its own compartment within a sturdy, portable storage case. This allows for quick identification and easy access to the correct seal when needed, helping to keep your workspace tidy and efficient. Material: Plastic.