They are easy to use. Simply spoon your tea leaves into the bottom of the infuser, push together and begin steeping your mug of tea. Made from food-safe silicone and stainless steel, makes these tea balls safe to use, durable and resistant to rust. Steel ball's holes design reduces floats and tea debris in your mug and unwanted leaves floating in your cup. The long flexible silicone handle protects you from heating up and burning your fingers because of the hot water.