No, MAGNA-TILES® and Magna-Qubix® products are not waterproof and should not be submerged, held under running water, or used in a pool or other body of water. If water does manage to sneak inside the pieces, we recommend standing them up against a wall to help them drain and dry. Don’t worry — there are no safety risks if your magnetic tiles take a dip. But while underwater adventures at bath time may be tempting, it’s best to keep your pieces on dry land to avoid mold, mildew, or rust.