Seatpost Shim - 25.4 to 22.2mm
To convert a unicycle (or bike) that normally fits a 25.4 seatpost to fit a 22.2 seatpost.
Length = 80mm
Note: shim will say 222-256 but it is the right size for a 25.4 frame, frames have a 0.2mm clearance on them so they actually have an internal dimension of 25.6mm.
When installing don't forget to apply a little grease to both sides of the shim.