110 kg/mm2 . "Top level" for shooters. The satin look and polished finish facilitate the release of the bowl. No maintenance is necessary. The super-soft bowl is prefered by shooters since there is less bounce after strikes, which presents an advantage after a direct hit. The Prestige balls are the jewels of the Boule Bleue collection. They are distinguished by their fabrication with fine steels, each ball is then hardened individually, before being subjected to a strong tempering.