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, including Item #5100-00.

This item is new, old stock. The blue 1g weights at the top have slight variations in color.

Set of 54 plastic weights include:

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

WARNING: Choking Hazzard: Small Parts. Not suitable for children under 3 years.