In the Nutri Ninja Smoothie Beaker 900 you blend fruit, yogurt and fruit juice into a healthy smoothie. The cups fit on the Nutri Ninja blenders. The threaded edge makes the seal watertight, so do not worry about tampering. Is your smoothie ready? Then unscrew the lid on the cup, drink from the spout without spilling. Slide the silicone holder around the cup so you can hold it comfortably.