The kit contains 1 large tray and 7 Puppy Trainer pads (custom-fitted to each size). The tray is non-slip for extra stability. You can use the kit as a toilet for dogs that don't go outside or for sick adult dogs. Using the tray ensures a clean home environment; the pad stays in place even if your puppy can't put it in his mouth and walk around with it. The Puppy Trainer pads are super absorbent; the surface of the pad dries after 30 seconds. Pad refill sets are available separately. The Puppy Trainer Starter kit is the perfect start to training your puppy in hygiene habits.