The infuser is constructed from silicone, which is soft, food-safe and tasteless, so it won't affect the taste of your tea.This tea infuser perches on the rim of your tea cup so you don't have to worry about fishing it out. 100% BPA-free silicone construction is easy to clean. The infuser measures 4-1/2 by 3 inches. (Box included...does not include cup.) This product is dishwasher and microwave safe. Shipped FREE within the continuous U.S.