These 3-D Magnetic building blocks are completely addictive to play with. The way they click together reinforces play in a most satisfying way. Not only are Magna-Qubix fun, but they also help develop fine motor skills as kids stack, build, count, match and “click” together their creations. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs. WARNING: CHOKING HAZARD—This toy is a marble. Not for children under 3 yrs.