Approximately 8-12mm thick felt. The size is approximately 250mm x 700mm, a large size. This is a large size, which was requested by many, instead of strips. *We have cut it generously to ensure there are no shortages. There may be variations in thickness and length. There may also be curling. Can be cut with fabric scissors. Utilizing its soundproofing and sound absorption properties, it is used for car deadening and cushioning materials. It will be folded for shipping. If you need other sizes, please let us know in the comments section. Please purchase with the understanding of the condition. - Material: Soundproofing Fabric - Texture: Soft and Thick Thank you for viewing.