140kg / mm2 + - 44HRC
Ball hard carbon steel. Request an interview by oiling.
The hardened steel ball 140 provides great hardness. The interest of a hard ball is its durability on all terrains.
It is especially used by the pointers. Natural blue reflections hardened steel are reinforced with a protective blue paint, which gradually diminishes with use.
It is this model that gave its name to the brand La Boule Bleue.