These are Louet's bobbins for Irish tension wheels. They have a lacquer finish. Louet standard and high-speed bobbins are large, easily holding 6 oz or more of yarn.

Ratios for bobbins:

• Standard 5.5, 7.5, 10.5:1
• Fatcore 6.5, 9.5, 15:1
• High speed 6.5, 9.5, 15:1

These bobbins the current S10 Concept Wheels with Irish Tension, as well as the older S10, S15, S17, S20, S51, S60, S70, S71, S75, S76, and S77 wheels. They do NOT fit S40, S45, S87, S90, or Victoria.