HX-C31 1, be made of neoprene + iron sand; 2, closed by velcro; 3, can be printed in client's logo HX-C31Sports usedifferent weights, colors, sizesdurablefashionable1, be made of high quality neoprene + iron sand;2, measure: 23.5cm X 7cm;3, closed by velcro;4, specificaion: 500g/pairs, 1000g/pairs, 2000g/pairs; 4000g/pairs Neoprene earth bag