Features Single door or double door. The cabinet is made of stainless steel. 2-steps in operation:-Retard;-Proof Durable construction. Doors with tempered glass. Easy maintenance. Working fast and efﬁciently, yielding even prooﬁng with full loads or partial loads. Castors. Sinmag retarder proofers are built with durable components and reliable, easy-to-use controls.