<b>Specification:</b><br> <b>Material:</b>304 Stainless steel<br> <b>Size: </b> 4.52*4.52*5.7 inches<br> <b>Microwave safe:</b>No<br><br> <b>Attention:</b><br><br> 1. Hand wash to ensure all parts thoroughly cleaned and protect appearance of your product.Lid can not put in dishwasher, silicon ring is removable to wash to avoid mold.<br><br> 2. Please fill right amount of food, better 1cm below the rim.<br><br> 3. When filling in hot content, please let the content cool down few minutes before closing lid. The steam will create internal and external air pressure causing hard to open or leakage due to the unbalanced air pressure, keep upright and do not shake, the air pressure will gradually be balanced. Testing with cold water inside, won't leak upside down even shaking. <br><br> 4.When close lid, if it's loose due to thermal expansion and contraction stress, after pour in hot contents few minutes, the internal pressure will make lid tight and well sealed.