BPA Free Food Grade Silicone. BPA, PVC, Lead, Metals, Rust Free. This is traditional teaching Montessori toy can increase the imagination and coordination of the kid, improve the eye-hand coordination and color & shape recognition. Stacking Rainbow block set in 7 different colours and sizes, Get all the blocks back together with different solution. Use your imagination, put out a variety of different shapes, Great fun for family and school. Children love coloured toys most, Varying ways to play with, can be used as building block, stimulate imagination and develop creativity and help develop intelligence.