1.without black point on smooth surface 2.the original manufacturer 3.specializing in producing plastic pipe transparent plastic pipe ... 1. plastic transparent pipe 2. Material: acrylic, pmma,pc ... tubes are as below (unit: mm):1.5,2.5,3,4.5,6,8,9,10,12, ... ,63,65,70,72,75,78,80,81,82,85,90,92,99.7 ,100,110,120,127,130 ...