As the owner of 3 hydration bladders, this kit is a must have. It has made cleaning the bladders much easier. The brushes are heavy duty, so I do not have to worry about breaking them. The kit comes with 4 pieces: flexible brush, smaller brush, bigger brush, and collapsible frame. The flexible brush is perfect for scrubbing down inside the hose. The smaller mouthpiece brush allows you to clean the mouthpiece. The bigger brush is perfect for cleaning the main body of the bladder. The collapsible frame is perfect for drying the bladder properly, so mold does not grow inside it. I no longer have to worry about bacteria growing inside our hydration bladders since I can properly clean them.