A fully vented and cross drilled disc - 16mm x 195mm for the 6-Pot SuperKart rear caliper (fits PVP).
 
 
 
These discs are extremely efficient at dispersing heat and are light weight to reduce rotational mass.
 
 
 
The Kelgate disc is lightweight yet strong due to the Cryogenic freezing and the solid cast process.
 
 
 
You will have to go a long way to find a better disc than a Kelgate.