1.neoprene cover 2.lead powder stuff 3.different styles,protect yourself with the soft material 1.outside:neoprene2.color:blue and black,we can supply other colors you like3.inside:iron ball,iron powder,lead ball4.package:mesh bag,ploybag,color box5.we have been in this line of business for 10 years and is one of the leading manufacturers of fitness equipments. gym weight for fitness