Slumber Pet Mega Ruff Empire Cage Mat Slumber Pet MegaRuffs Mats are the future in chew-proof dog mats! The perfect choice for powerful, active chewers Made of chew-proof polyester ripstop fabric with double-stitched seams and reinforced corners for unmatched durability Sized to fit ProSelect Empire Cages  the Alcatraz of pet cages Also available in Large