This set engages young learners in a wide variety of measuring activities. The accurate, colour-coded plastic hexagrams are durable and can be used with any balance. Includes 20 each of 1 gram and 5 gram weights, ten 10 gram weights and four 20 gram weights, stored in a plastic storage box. Size: 15.5 x 11.2 x 3.8 cm. Ages 8+.