Beautiful set of 70 tree blocks. The set includes 70 wooden tree blocks ranging from 1 cm to 10 cm. Bring nature into the classroom and reinforce key maths concepts at the same time! A great set to practice with basic number sense, addition, subtraction, and fractions. The set is conveniently housed in a cotton bag for easy storage and a quick tidy up. All Qtoys products are made of plantation timber using non-toxic, child safe materials.