1. Material: We use the superior environment friendly plastic which meets FDA and RoHS standard. | 2. Patent: We have obtained two invention patents, and patent applications cover Hong Kong, as well as many foreign markets, such as the USA, Europe, South Korea and so on to protect customers’ benefit and avoid being judge infringement. | 3. Function: We have professional negative pressure test repor authorized by SGS, which can keep sealing for 1 hour without leakage under negative pressure