suitable for 150-300Mpa hard rock,high-wear rock strata,such as granite,diorite,prophyry,serpentine and basalt. Material of cutter ring GSY,with hardness HRC61-64,Ingredient confidentiality.

https://www.attacking-rock.com/GSY-High-processing-property-Cable-Tunnels-Tbm-disc-cutter-pd42593201.html