Newest Non-toxic FOOD GRADE PP material, tested for US/EU food safe standards. Dishwasher and microwave safeFinger grooves ANTI-SKID design make our shaker bottles comfortable to hold, carry and drink fromThe mix ball is made from top quality plastic material which is rust proof, never chip or peel. EASY TO CLEAN and it is safe to leave the ball inside the bottle while you are enjoying the drinksLEAK PROOF seals and secure flip-top lid for confident transport, easy shaking and mixingCONVENIENT embossed ounce and ml volume measurements ,