Connect, twist and stack these fun fidget blocks together! 8 different peg-and-groove configurations glide smoothly, turn easily, and hold snugly. Build robots, castles, letterforms and numbers — or just fiddle with them. A handful of blocks will keep fidgety fingers occupied for hours. In the classroom, Lock Blox provide more than just idle motions. These versatile building and construction blocks are good for mathematical counting/sorting activities, as well as curriculum based engineering projects. For people with disabilities that restrict motor functions, Lock Blox can provide a valuable exercise to help strengthen manual dexterity, and hand-eye coordination. Includes: 96 blocks (red, yellow, green, blue): 16 squares – 1.25" (3.175 cm), 16 rectangles – 2.5" (6.35 cm).