Polyester fabric with silicone resin processing. 3 times more durable than traditional rice cooking nets. Silicone resin processing, so it wont stick to the net. Reduces stickiness to rice cooker. Easy to wash the kettle and save water. Reusable and economical For cooking 1 to 3 sho. Food Sanitation Law Compliant Made of polyester fabric with excellent heat resistance, so it can be used repeatedly.