The world famous OX Accelerator furnace bake-coated with Molybdenum & PTFE for Progressive Lubrication & Rapid Acceleration. With up to 40% more compressed poundage than conventional mainsprings.
Fits HW77, HW97, Feinwerkbau Sport, also larger original models if ultimate power required.HW77, HW97, Feinwerkbau Sport, also larger original models if ultimate power required