Features: 1) Dustless: with few powder fly off when playing, thus protects players from inbreathing harmful dusts 2) Sensitive: let the musical instruments be more sensitive, timbres purer and more attractive, and lower down noises 3) Strong adhesion: each rubbing on the bow hair provides more than double lasting periods than using other rosins Inner packing: 12pcs/box Box size: 16.6 x 11.2 x 7 Outer packing: 120pcs/ctn Carton size: 35.5 x 29.5 x 16 N.W.: 30g G.W.: 60g