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 nine weights consisting of one each 10g, 50g, 100g, 500g, 1,000g, and two each 20g and 200g weights. Please note: because of its size, the 10g weight does not include a countersunk bottom. Weights are made of polished brass and come in a storage block. Replacement weights are available separately.