These buckets are ideal for making custom hydroponic systems as well as storing and transporting liquids and nutrients. Constructed from high density polyethylene, they feature a sturdy steel handle with a molded grip. These buckets are ideal for making custom hydroponic systems as well as storing and transporting liquids and nutrients. Constructed from high density polyethylene, they feature a sturdy steel handle with a molded plastic grip. The black colored plastic keeps the inside completely dark. These buckets are tapered for easy stacking, storage, and low cost shipping. They can withstand temperatures of up to 180. Compatible lids are also available.