Hooked Weight Set, Material: stainless steel, Both sets come with a sturdy plastic storage block, includes one each of 5g, 10g, 50g, 100g, and 500g, plus two each of 20g and 200g weights, set of 9
Density Set Polypropylene, Set of 12 Polypropylene cylindrical bars of different length but the same diameter. Students learn that the density of a substance is constant even as itsmass and volume change. Comes in an attractive wooden holder