ASR Outdoor Rubber Riffle Sluice Box Matting is made of durable, one-piece flexible rubber that will not harden or crack in cold weather. Designed with three traditional, proven authentic gold collection ripple patterns. These Gold Recovery Ripple Traps are explained in detail below. Designed to maximize the amount of gold nugget and gold flakes trapped in the mat when separated from raw screen material. This gold panning rubber water gate box mat can be used either as a hydration box or alone. Manufactured from Green Thermoplastic Rubber (TPR), you can easily find small gold powder, gold flakes, gold nuggets, gemstones or other minerals with optimal clarity and ease. Ripple Trap Gold Thru Box Mats are pre-scored so they can easily be cut to just 8" wide using the guidelines located on the back of the mat. Overall, the mat measures 10" wide x 27" long and the lip trap runs the full length of the hydration box mat. This is a great aquarium mat that works with fast or slow water and increases the effort to explore gold and collecting gold and minerals.