You are buying a set of CP Pistons which include the following in the box:

* 4 Pistons
* 4 Wristpins
* All the locks
* All the rings

Part Numbers
CP Pistons: HONDA/Acura for K20 K20A K20A2 K20A3
Make Part # Engine Bore Size Compression Ratio
Acura/Honda SC7040 K20A/A2/A3 3.386 STD 9.0
Acura/Honda SC70401 K20A/A2/A3 3.406 +.020 9.0
Acura/Honda SC70402 K20A/A2/A3 3.425 +.040 9.0
Acura/Honda SC70403 K20A/A2/A3 3.465 +.080 9.0
Acura/Honda SC70404 K20A/A2/A3 3.504 +.120 9.0
Acura/Honda SC7140 K20A/A2 3.386 STD 11.5
Acura/Honda SC71401 K20A/A2 3.406 +.020 11.5
Acura/Honda SC71402 K20A/A2 3.425 +.040 11.5
Acura/Honda SC71403 K20A/A2 3.465 +.080 11.5
Acura/Honda SC71404 K20A/A2 3.504 +.120 11.5
Acura/Honda SC71405 K20A/A2 3.543 +.160 11.5

If you do not know the CP Pistons size you need, please contact us so we could help! 321-251-7845 or email us at: sales@delirium-motorsports.com