... 3.environmental friendly Casting dumbbell1.type:wy-19012.material:the dumbbell is made of cast iron,durable and high quality3.specifications ... many kinds,it includes the light of dumbbell and heavy dumbbell.the weight of light dumbbell such as 6,8,12,16 pound ... ,the weight of heavy dumbbell is 10,15,20,25,30 pound4.the casting dumbbell can be used in the ...