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 32 piece interlocking block set is perfectly sized for your next adventure, car ride, or waiting room. Contains 32 small interlocking felt blocks: 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+