This is the event additive for the 2024 Challenge Cup. 
This additive is only available for collection at GRCR during the Challenge Cup weekend.
 
TDK Edge is the event additive for the following classes:
ISTC 21.5 Challenger
ISTC 21.5
ISTC 13.5
ISTC Open
GT 17.5
TCR
TDK Edge can also be used for;
1/12 Stock
VTA