Bobbin to wind narrow & long PP film. D : 107 to 110mm d : 37 to 38mm h : 35 to 36mm W : 9.5mm, 13.5mm, 21.5mm, 25.7mm D & d & W is most important. D(107 to 110mm)-d(37 to 38mm) = abt.35mm(wound PP film thickness)