sand bag,wrist sand bag,ankle sand bag,sport sand bag, good to practice sport,keep your body health. soft material+iron grain. we are now supplying you a variety of sand bag,sport sand bag,wrist sand bag,ankle sand bag: 1)material:2mm neoprene+double nylon be made of neoprene with stretchy fabric; 2)fit for practice sport,keep your body health. 3)waterproof,durable,convenient and comfortable ...