These color-coded stacking masses help children see mass or weight relationships at a glance. Each weight is a different color and thickness, so they are easy to understand and manipulate for small hands. They are perfect for use with a wide variety of balances.

Set of 54 plastic weights includes:

• Twenty (20) blue 1g weights
• Twenty (20) red 5g weights
• Ten (10) yellow 10g weights
• Four (4) green 20g weights
• Plastic storage box