I had a couple of sets(Front & Back) of JL, RJL, and SRJL Vesrah brake pads.
New in the packages for RC-51s, and 4 piston caliper Ducati.
As MadBuyer specified..............
The differents are in the compounds of material the pads are made of..
JL -are streetable
RJL -are track
SRJL- the ultimate track pads
Suggest the JL2 set.