Widely soft silicone o ring kit application: pneumatics sealing, ressure valve, reaction valve, filter, mechanical gas compressor, heat exchanger, boiler, filter, blender, coffee machine, plumbing. Our O-rings feature a smooth surface, ensuring excellent sealing performance and mechanical durability and also the high-quality materials guarantee stability and an extended lifespan. Clear food grade silicone O Rings better sealing than rubber o rings has environmental protection,safety. 15 different sizes o-ring, 225 pieces, made of silicone for use with a variety of chemicals and fluids, prevent leaks in plumbing, hydraulic, and pneumatic repairs. Comes with a plastic storage case. Food grade silicone O-ring available in various standard sizes for different applications. The special tool bag is provided for easy storage and transport of the entire tool set.