Genial for protein shakes

My girlfriend and I use the Blender ball for making protein shakes. Just pure powder, ball purely, water / milk to and shake. In my opinion, it goes much faster than only with the sieve and shakes pleasantly creamy (especially with milk really awesome).
As in the package are 5 pieces, we have 2 given away to friends and the rest of the 3 spread over our 3 Shaker. For the price really great!