Corrugated Plastic Welded Trays are compact, nestable and made for durability. This corrugated plastic tray works well for handling supplies and materials, paper storage, and organization. The trays measure 18" x 12" x 4.5".. Lightweight and sturdy. Cut out carrying handles. 100% recyclable plastic construction. Nests for storage. Sonic welded for durability & strength. Made out of HDPE Corrugated Plastic. 3+ years. Grade PK+