continuously forming a continuous strip of aluminum sheet material using a belt caster for forming a continuous strip of aluminum sheet material and a roll caster for immediately reducing the thickness of the continuous strip of aluminum sheet material wherein the continuous loop belt means used in the belt caster are driven by the rolls of said roll caster application_number US 72510685 A description in general as shown in fig1 the invention comprises a pair of continuous loop steel belt means 20 22 having front end portions 24 26 mounted on and driven by a pair of roll means 28 30 of a conventional roll type caster rear end belt portions 32 34 are supported by semi circular guide means 36 38 outer intermediate belt portions 40 42 extend inwardly and rearwardly between roll means 28 30 and guide shoe means 36 38 inner intermediate elongated straight portions 44 46 extend forwardly between guide means 36 38 and roll means 28 30 in spaced generally parallel relationship to define an elongated cavity 48 of rectangular cross sectional configuration therebetween as explained below the cavity 48 will have a slight taper with the smallest portion adjacent to the rolls 28 and 30 dam means 50 52 are located on opposite sides of the cavity 48 for confining the molten material therebetween the dam means comprises a plurality of individual short length dam members 54 55 56 58 etc fig1 mounted on a continuous loop chain means 60 for movement about sprocket means 62 64 to provide an innermost intermediate length portion 66.