Strainers are made from materials that include: stainless steel, tinned steel, aluminum, nylon, and cloth. The construction of the different types of Strainers varies from light weight to heavy duty with frames that are quite strong and durable to hold the anticpated contents. Some Strainers have formed edges with "hooks" which allow the sieve to rest on top of pots or bowls while the contents are being drained. A Strainer is also referred to as a "Sieve."