Light weight with ceramic fibre wool insulation (instead of Brick insulation). The outer casing is made of double walled thick P.C.R.C. Sheet, duly painted. Heating elements are made of KANTHAL "A-1" wire and backed by high temperature cerwool insulation, which avoids loss of energy. Temperature is controlled through Digital Temperature Indicator- cum-controller. To work on 220/230 volts or 400/440 volts A.C. Maximum Temp. is 10000C and working temp 9000C. For models of higher temperature the maximum temp. is 12000C and working temp. 11500C.