You will receive 15pcs gaskets, suitable for different types of pressure cookers. Not more worrying about missing part. First insert the smaller side of the float into the top of the handle and then place the seal on the smaller side so that the float remaining in the grooves of the valves. The seal is selected from silicone, you can use it safely. The silicone lid wears out due to all the heat and pressure in the cookware. You can also lose when you lid. So prepare a few more for easy application. These accessories also suitable for commercial kitchens in restaurants and hotels, ensuring accurate and safe food processing on a large scale.