Rubbermaid Commercial 353900GY Square Brute Lid, 24 x 24 x 2 1/5, Gray Square, high-density polyethylene (HDPE) lid for use with Rubbermaid Commercial Brute 3536 container (sold separately) High-density polyethylene (HDPE) is stronger than low-density polyethylene (LDPE) and resists moisture and certain chemicals Tight-fitting design helps control odors and keep contents dry Rounded corners make the lid easier to clean than lids with squared corners Meets NSF/ANSI Standard 21 for indoor or outdoor storage of refuse