LocknLock Easy Essentials Food Lids (Flip-top) / Pantry Storage Containers, BPA Free, Top-10 Cup-for Snacks, Clear

material: PP, Silicon [ Feature ] 1. Airtight Lockage All passed the leakage tests by authoritative local and international institutes. 4-side of locking system of lock and lock makes it possible to be airtight due to equal pressure to all 4 sides. Locks tightly with hollow-center silicone. Strong airtight lock with hollow-center silicone. Airtight seal with great elasticity power locks tightly with hollow-center silicon. 2. Durability It has passed the KEMTI’s bending test. The container and the wing were fixed to the bending test machine and bent. 3,000,000 times 80 degrees left to right. If the container were to be used 10 times a day, it could be used for 821 years(semi-permanently). Durability of Lock and Lock is safe for change of temperature from -4°F to 210°F. It makes Lock and Lock available for use in the microwave, freezer and dishwasher. 3. Healthful living Used superior raw material with durability and heat-resistant ability which is friendly to the human body. Passed the strict hygiene and safety tests of U.S. and German SGS. 4. Space Saving Design Stacking system aims to help space saving. The design of the containers enables excellent space saving in the refrigerator, freezer, cupboard and drawers.