270Pcs Rubber Seal O-Ring Washer Gasket Assortment Kit Hydraulics Air Gas Oil AUFeature: Made of rubber. High Resilience and High Tensile Strength. Not easy torn apart. It is no pollution and no abnormal smell. Durable and long service life. Stored in a labeled and organized resealable case saves you effort in tidying up and choosing sizes. Variety of thickness and size are all in one box, very convenient to use. Soft and flexible o ring, simply snap on, easy to install, great for sealing gasoline, diesel oil, lubricating oil,