Approximately 8-12mm thick felt. The size is approximately 250mm x 700mm, a large size. This is a large size, which many people requested, instead of strips. *We have cut it generously to avoid shortages. There may be variations in thickness and length. Can be cut with scissors. Utilizing its soundproofing and sound absorption properties, it is used for car deadening, cushioning materials, etc. 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.