Stacking Metric Mass Set

These inexpensive masses are great for adding a load to model vehicles, trebuchets, and other science experiments you might need to weigh in on. They stack and come in four sizes that are each represented by a different color – so it’s easy to see how much mass you’re working with.

Each set comes with five 20-gram pieces, five 10-gram pieces, ten 5-gram pieces, and twenty-two 1-gram pieces.