Features: 1) Should be stored in the dry and ventilating storehouse, avoided moisture and fire, and should be kept in the package before use 2) Storage time: 5 years 3) Available sizes (mm): 230 x 22-40; 180 x 22; 150 x 22; 125 x 22; 115 x 16; 100 x 16 4) Available grit: 16# - 240# 5) Fiber thickness (mm): 0.6 - 1.2