Since these products bridge the gap between stationery and toys, they must meet rigorous safety standards. For the US market, compliance with ASTM F963 (Standard Consumer Safety Specification for Toy Safety) and CPSIA (lead and phthalate limits) is mandatory. For the EU market, products must carry the CE Mark and comply with EN71 (Parts 1, 2, and 3), which covers mechanical properties, flammability, and migration of certain elements. Additionally, ensure the ink is non-toxic and conforms to ASTM D-4236.