Building blocks are perfect, all-purpose learning games, and this strong and durable set is a wonderful way to teach toddlers and preschoolers color recognition, shape recognition and the rudiments of counting. It's also a fantastic way to instill a sense of creativity when little boys and girls build houses, castles - anything their imaginations desire! ( 100 pcs. per unit) 3 1/2" © 2016 Melissa & Doug, LLC. All Rights Reserved.