The Louet IrT Standard Bobbin is made for all Louet's Irish tensioned wheels. It works on their newer and older wheels such as: S10, S51, S20, S60, S70, S71, S75, S76, S77.
 
Specifications:
 
Ratios: 1:5.5 / 1:7.5 / 1:10.5
Finish: Lacquered