The mats have been constructed from tightly woven straw. These Tatami mats have been made specifically for cutting tests. This listing is for 20 Mats. Instructions for using the Mats: 1. Roll mats as tightly as possible and tie them off. 2. Soak the mats in water for twenty-four hours. 3. After the mat has been rolled, tied, and soaked it should be about the width of a man's thigh. 4. Mount on a cutting stand and enjoy. Additional Details ------------------------------ Product description: The mats have been constructed from tightly woven straw. These Tatami mats have been made specifically for cutting tests. This listing is for 20 Mats. Instructions for using the Mats: 1. Roll mats as tightly as possible and tie them off. 2. Soak the mats in water for twenty-four hours. 3. After the mat has been rolled, tied, and soaked it should be about the width of a man's thigh. 4. Mount on a cutting stand and enjoy.