Model: DS50 DS80 DS120 DS200 Roller diameter: 5080 120 200 Length of roller: 150 200 250 600 Ratio of speed: 1:3:9 1:3:91:3:9 1:3:9 Roller material: specia alloy steel Motor power: 0.5 1.1 2.2 15 Overall dimension:350*320*320 , 720*410*470, 820*650*740,1500*1100*1150 Weight: 90 115 280 1200 More details pls feel free to ask.