LitterWorks Eco-Tray kit #2: An eco-nomic, eco-friendly permanent tray kit, replaces disposable cardboard litter trays. Compatible with Scoopfree&reg;, Scoopmaid&reg;, and Just the Crystals&reg; litter. Includes "Nose Guard", cleaning tool, and 2 carbon odor absorbing filters! -Made in USA Made of durable, ABS plastic "Single piece" molded construction is seamless and cannot leak Includes "nose guard" plastic strip to reduce odors Includes (2) Odor absorbing carbon filter pads plus mounting velcro strips Includes special cleaning tool for removing wet crystals