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. *Cut generously to ensure there are no shortages. Thickness and length may vary. Can be cut with scissors. Utilized for soundproofing and sound absorption, used in car deadening and cushioning materials. Will be folded for shipping. If you need other sizes, please let me know in the comments section. Please understand the condition before purchasing. - Material: Soundproofing Fabric - Texture: Soft and Thick Thank you for viewing.