The donut head joint is an alternative head joint option for the jFlute or Student Flute. Basically, it uses the same technology as the curved head joint but condenses it into a small donut looking shape. The benefits are that the head joint is always in line (no messing with moving curved head joints) and it also brings the flute in closer to the body for smaller reaches. It comes in white or black and is compatible with both the jFlute 2.0 and Student Flute.