Learning Resources Weight Pax Metric Weights, Set of 58 with Box
Use alone or together with Customary Weight Set for comparison activities.  Set of 58 contains 20 each of 1 g and 5 g, ten 10 g, four 20 g, two 100 g, and 1 each of 500 g and 1000 g weights. Stackable, color-coded weights come in a plastic storage box.