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. Weights are made of polished brass and come in a storage block. Set of nine weights consisting of one Each 10g, 50g, 100g, 500g, 1,000g, and two each 20g and 200g weights.