Cooling Insert for Teesa TSA3538 Personal Blender If you own a Teesa TSA3538 personal blender and want to enjoy your smoothies colder for longer, the TSA3538 cooling insert is the perfect addition. It will keep your drinks fresh and cold for longer, making every moment with a healthy smoothie a pleasure. High-quality materials The cooling insert is made of high-quality PP materials that are BPA-free. This means you can be sure that the product is safe to use and does not affect the taste of your drink.