I have a lightly used set of AK20 cartridges for a 2011+ Suzuki GSXR600/750. They are take-offs from a new race bike and are in great condition. They come with two sets of springs (i believe they are .95s & 1.0s but i will confirm) along with the cartridges. Retail is $1100 and I'm looking for $500 obo. Let me know if you have any questions, Thanks IJB here's a link to the product detail http://traxxion.com/product/cartridge-kit-ak20s-gsxr600-6/