Retro Robot Collection. There's no danger here, Will Robinson, the friendly Retro Robot Collection is inspired by an innocent era when gears, bolts, and springs were what little boys' thoughts were made of. Domo arrigato, indeed. The melamine Sippy Cup holds 6 ounces. BPA free, dishwasher safe. Hand wash for best results. Do not microwave. Non toxic and lead free according to United States, European and Canadian standards.