Forever Litter Tray Reusable Replacement for ScoopFree Refills. Bringing You the Best Quality, Design and Durability Since 2005 Offering cat owners the greener, cost-saving alternative since 2005. The time-proven, best-selling permanent ScoopFree compatible litter tray design from the original innovators One-piece construction, high impact anti-microbial plastic, light beige in color. Strong construction won't leak, is easy to use and has no metal parts to rust For best results & ultimate convenience we recommend using pre-measured Just the Crystals premium litter Best quality construction & latest updated design fits both ScoopFree Ultra and Original machines