Learning Resources Measuring Worms - 72 Pieces, Ages 3+ Toddler Learning Toys, Counters For KidsStudents get a grasp on early math skills with these squishy, colorful worms that make counting, sorting and measuring fun. Worms can be used to teach both standard and non standard measurement. The Learning Resources Measure Worms Set of 72 Features: 72 worms in 6 colors and 4 sizes (1', 2', 3', 4'L) Activity Guide Convenient storage bucket