100% green material, food level PP, safe and environment friendly, heatproof, temperature range from -68 to 248?.Designers considered every detail, rim of cup is R1 arched to fit both lips.No dead corner at bottom so it's easy to clean.Diameter is 72mm, proper size to hold, the surface is dull polished and feels like a baby skin.4 colours to choose, different colour for different people.350ml, no need to add water frequently.Uviviu gargle cup with environment friendly package which is able to be recycled