Lightweight and sturdy, these innovative connecting blocks encourage creative problem-solving along multiple mathematical planes. Made from felt out of recycled water bottles, our washable Classic Set fosters creative problem-solving and collaborative play. Truly an open-ended learning toy: this 68 piece interlocking block set is perfectly sized for 2 or more children to play simultaneously. Contains 68 assorted interlocking felt blocks: 12 medium blocks 6 medium half blocks 44 small blocks 12 round joiners Deceptively simple; our straightforward toys foster creativity and invention. Designed by a Speech Language Pathologist, Lowercase Toys are made for play. Recommended for ages 3+