This heading of this ring forms a stylish 6 spline 'cogwheel'.
The heading is laser cut from 4mm birch plywood board. The ring itself is 6mm thick.
The size of the ring itself is selectable, available in 18 sizes from 48 to 70mm (inner circumference). The ring simply sticks into the middle of the heading without the use of any glue. Sides of the ring is untreated, the outer curved surface is painted to black.
The ring is available at the following marketplaces.