This is simply one the best replacement kits available for your Aprilia. The combination of  D.I.D 525 ZVM2 Series chain, and the Drive Systems Steel Rear Sprocket make this a great looking, long lasting upgrade. 

Each kit includes:
 

• one Chromoly Steel Front Sprocket
   
• one Hardened Steel Rear Sprocket (Black)
   
• D.I.D. 525 ZVM2 Series Heavy Duty Chain (cut to correct length)
   
• one Rivet-Syle Master Link