These are negative side edge angle tools for professional edge tuning. Teflon coated for easy glide. Exactly what is used by World Cup pros.
Available in side edge degrees of 87, 88, and 89. The 87 would give you a 3 degree side edge which is very agressive, the 88 a 2 degree edge and the 89 a 1 degree side edge commonly found on many race ski purchased off the shelf.
