The Viagrow 4-Site Mesh Bucket Lids are heavy-duty, wide-lip bucket lids with four 3 in. mesh pots. The Vegi bucket lid is designed to fit on standard 3.5 gal. and 5 gal. buckets and has an easy on and off ability. The Vegi lid has four 3 in. net cups that are great for all hydroponic and container gardening growing applications as the mesh pot creates ample aeration for root development and deters weeds. In addition, the black opaque plastic will keep light out thus preventing algae from growing in your growing chamber. For ideal results use VS2 or VS10 Viastone grow rocks as your media in hydroponic applications. Will fit standard 3.5 gal. and 5 gal. buckets The 4 mesh pots are 3 in. W x 3 in. D and there are 4 pots in the lid. Overall dimensions are 12 in. L x 12 in. W x 3 in. D. Sturdy and easy to clean, with easy on off lip. Black opaque plastic keeps light and algae out. The shipment includes 5 bucket lids.