Cap for Zone sticks. A relatively thick knob that gives a proper finish at the top of the shaft. Available in white and black.
Measure:
Inner diameter: 25 mm (fits shafts with this dimension)
Outer diameter at the bottom: 28 mm
Outer diameter at the top: 31 mm
(The knob is slightly smaller at the bottom before assembly, but is a little "stretchy", which means it fits perfectly on 25 mm thick shafts anyway)