The Secure Personal Care SP13150 Underpads are large 23in x 36in dog pee pads designed for puppy training. Made by TotalDry, these underpads feature a super absorbent material consisting of plastic, cotton, and varying components. With no expiration date, these unisex pads are easy to use and help keep your home clean while training your furry friend. Each pack includes 50 Underpads providing plenty for ongoing use.