1. Stainless steel protein shaker bottle body with mixing ball to help completely dissolve powder in water without caking, for mixing protein powder shakes, martinis, cocktails, smoothies, juices, fitness, outdoor sports and supplements., 2. Blender bottles uses kitchen grade 304 stainless steel and tritan material for protein shakes , PBA-free , for human safety and health., 3. Shaker Bottles for Protein Mixes with non-slip rotary opening lid for strong sealing and no leakage, flexible handle on the cap easy to carry, perfect for Gym fitness and workout., 4. The bottle’s patented mixing system utilizes the BlenderBall wire whisk to mix even the most stubborn protein powder. A rounded base ensures a smooth blend.