All Wiseco pistons are forged from aerospace aluminum alloys on Wisecos state-of-the-art forging presses Built on a legacy of championships for over 60 years by American craftsmen Wiseco pistons have the latest dyno-tested technology to out-perform the competition Wiseco forged pistons are priced with rings and circlips Wiseco rings, clips and wrist pins only fit Wiseco pistons; also note that ring types do not interchange (i.e. CD is not interchangeable with TD) - DRR DRX 70 (2008, 2010, 2013, 2009, 2015, 2018, 2016, 2017, 2012, 2014, 2019, 2011)