These red and blue numbers in 5 gram weight increments (5 grams to 50 grams) let you teach about number value, weights and early number skills. When used with Primary Bucket Balance (LER 1521) you can demonstrate 2 is less than 8; or 2 + 4 in one bucket is equal to 6 in the other. Each number is spelled out on the back to reinforce word recognition and odd & even numbers are color coded. Each number measures 3" x 2" x .5".