This set contains 144 assorted shapes and struts with 6 different components that slot and slide together in various ways. Includes a handy storage tub. The set contains 85 flats, 14 single pegs, 14 twin pegs, 14 twin discs, 7 quad disks, 10 struts, and an exploring booklet. Suitable for ages 3+. Diameter of discs: approximately 60mm.