Health material: Made from BPA materials. The filter is 304 stainless steel, the lid is AS, and the outer box is PET, ensuring safe food preparation with durable, longlasting performance. Upgraded leakproof design: The lid helps prevent dust and odor. Ventilation holes in the lid can be closed to seal the food or opened to let air circulate. A builtin silicone sealing ring provides a secure, odor seal. Multifunctional: Use this yogurt strainer to make yogurt, cheese, and sauces. It can also filter nut milks, juice, and yogurt. It can be used as a tea filter, and when the strainer is removed, it doubles as a fruit carrying box. It has a large capacity of 1100 ml to hold a substantial amount of yogurt. How to use: Four simple steps to enjoy delicious results: 1. Pour yogurt. 2. Refrigerate for 48 hours. 3. Remove and serve. 4. Strain whey to serve. The unit naturally drains in the refrigerator; filtration time affects thickness—for a thicker result, refrigerate longer than 48 hours.