These are the latest leak proof shakers from buchsteiner our new myproteincouk mixmaster shakers made for us by the world famous buchsteiner in germany these really are the ultimate shaker for a superb price the mixmaster shakers are what everyone needs when mixing supplements these shakers are the latest design as they come with a mesh grill which helps make the drink lump free also they come with a screw top lid so it makes the shaker much more secure when shaking the shaker cups a