Certified ASTM D4236 For ages: 14+ Product certified for LHAMA, FHSA, ICP-OES (Lead & Cadmium), CVAA (Mercury), ASTM DF963-17AS (Flammability), ASTM D6007 (Formaldehyde). No batteries required. Watch these tips before starting: https://youtu.be/vCtTfemvE1M Plain plywood products can be painted with thin water-based paints, except the gears, not to obstruct the mechanisms. Read instructions before building. Warning: Choking hazard- Small Parts. Caution: Functional sharp points.