These weights feature flat countersunk bottoms, with a double-ended hooked rod through the middle. They can be used on balance pans, as well as hooked in tandem for lever arm studies. Set of 9 weights consisting of 1 each 10g, 50g, 500g, 1000g, and 2 each 20g, 200gram weights. Weights are made of polished brass and come in a storage block. Replacement weights are available separately. Additional Info: hooked double-ended brass weight set of 9 Package Size(L x W x H): 8.8 X 4.5 X 4.3 (IN) Categories: Weight Sets, Hooked HTS Code: 8423.90.0080 UNSPSC: 4.11115e+007 Country Of Origin: INDIA