iCube Extra Shelf for Modular Smart System No tools required, using snap lock technology. Just snap, lock and go! Made from sturdy and durable High Impact Polystyrene (HIPS) Designed to complement and fit the iCube Smart Storage System Each single cube can fit up to 3 shelves (sold separately) Dimensions: 12.8"(H) X 12.8"(L) No tools required, using snap lock technology. Just snap, lock and go! Made from sturdy and durable High Impact Polystyrene (HIPS) Designed to complement and fit the iCube Smart Storage System Each single cube can fit up to 3 shelves (sold separately) Dimensions: 12.8(H) X 12.8(L)