B622Lifting, bending, carrying, stacking – large muscles and imaginations are hard at work when your children build with these easy-to-grasp blocks. Hollow Blocks can be used with Mini Unit Blocks, Unit Blocks, and Mini Hollow Blocks; they share the same modular dimensions. Our Hollow Blocks can take the wear and tear builders will give them. All edges are chamfered for safety. Constructed of solid hardwood, and protected by non-toxic wood preservative. All joints are securely fastened with screws. Open ends allow small hands to pick the blocks up easily. Dimensions of Square: 14(H) x 28(W) x 28cm(L). .