Wittner Finetune Pegs Slim for Cello 4/4 set of 4. 272111S04
272111S04, Small - 12.5mm at Ring. It is sufficient just to turn the internally-geared head. FineTune Pegs do not move in the pegbox, so wear on the pegbox is massively reduced, and they are not susceptible to atmospheric or climatic influence.