Food-grade stainless steel: Made of high-quality stainless steel, environmentally friendly, healthy, safe and durable. Smooth Surface: Carefully polished, the surface and corners are smooth, preventing scratches on tea sets or cups. It's perfect for teapots, teacups, coffee mugs, pot handles or stock pots. FILTER FUNCTION: The infuser has small holes to brew tea leaves without floating leaves in your teacup. Spring Design: Spring-loaded push handle for easy opening and closing of the infuser. Enjoy tea with ease. EASY TO CLEAN: The tea strainer is very easy to clean and is dishwasher safe. Turn on the ball injector and rinse both pieces under running water. Let them dry after cleaning for better maintenance.