[Size] - Fit for: 0.5/1/1.5ml micro-centrifuge tubes, 100 Places; Overall Size: 133x133x52mm / 5.24*5.24*2.05 Inch (L*W*H); Hole Size: 12x12mm / 0.47*0.47 Inch. [Material] - Made of cardboard, lightweight, easy to carry and safe to use.