There are 4 clips on the outside of the food sealed fresh-keeping box, and there are round sealing strips inside to keep the food fresh and clean. Robust design and airtight seal prevent leakage.
It is extruder, cylinder and screw rods are made of quality alloy steel that have been nitrized and processed in a precision way. Hence it is sound in hardness, durable in corrosion resistance.
Feature: 1.this bottle made of high quality stainless steel material: #304(also called 18/8 stainless steel, that's a best quality steel.), 100% BPA free, better for the healthy, this reusable bottle is BPA-free and toxin-free making it eco-friendly.