BPA-FREE - The coffee ground knock box is made of special ABS plastic to prevent bacterial growth from the Inside. Safe enough to use! The removable knock bar makes it easy to clean. You can clean it by hand, dishwasher safe, save your time on washing the coffee tool. LIGHTWEIGHT AND PORTABLE - Easy to store and carried, fit for kitchen and office. Rubber grip on the bottom of the coffee knock box will keep it from shifting during use EASY TO CLEAN - The knock-box and knock-bar are dishwasher safe, save your time on the washing the coffee tool Luxury coffee knock box fit for home baristas, coffee enthusiast, bars, coffee shops Coffee Knock Box with Knock Box Bar Color: Black Knock Box Material: ABS plastic Knock Bar Material: aluminum, covered in rubber and stainless steel edges. UNIQUE DESIGN - Bayonet deep bay design makes coffee slag not easy to splash while oblique mouth allows you to use more conveniently. WIDELY USED - Can be used at home, cafe shop, canteen, restaurants, bars and more.