Bucket is a rugged 90 mil and made from FDA compliant (food grade) high density polyethylene (HDPE). We install an oversized grip for a more comfortable use. Not all of us have the leather hands of an iron worker and those buckets can get heavy. The Gamma Seal lid provides easy spin on and off, The outer ring snaps on to the bucket with an O-ring gasket. The lid then seals to the ring with a second O-ring gasket. Gamma Seals are user installed but may be pre-installed for shipping efficiency. A rubber mallet may be required for Gamma Seal installation. Shipping is included in the price!