1. Package Include: Dog Grass Pad with Tray Set of 1 and 2PCSReplacement Grass 2. Bionic Wall3Piece System, Easy to Clean dog grass pad features a threelayer design, the sloped undertray with ridges design captures and leads the urine down into the collecting box through the drainage hole for easy disposal. The upgraded bionic wall helps guide dog urination and also prevents urine splash. 3. Unique Hemming Grass Mat, More Your dog won't drag the turf out of the potty pad anymore because of the Hemming Grass Mat design. It avoids grass edge shedding, cracking, and dross. Puppy turf pads are made of highgrade UVresistant polyethylene and polypropylene yarn, designed to withstand harsh sunlight or dog pee without degrading. 4. 56 Drainage Holes, Effectively Controls OdoursThe more drainage holes, the better the drainage! Dog grass pads have 56 Drainage Holes to ensure good drainage. Other products with drainage holes farther apart or no drainage hole may have dog pee remaining between drainage holes, creating lingering odors.