foam, light weight and portable. It is suitable for all kinds of rubber putty, not only for foam mud. Packed in resealable bags, color bleeding when use, easy to take and store, mess and more convenience! Great for box filling, glass bottles , lazy sofa cushions pillow and plush accessories. Also perfect for home decoration and craft making, like dolls and vases filling, craft projects finishing and in boxes, helpful to ' creativity and release adults' stress, best gifts for .