When I make my rings I heat treat them with lower tension. What this meens is less heat buildup in cylinder while engine is running. I also use fine grained cast iron for rings which seats quicker because my rings are round. Other manufactures rings are made made of unknown materials and are very hard. These rings just don't seem to ever seat and a lot of compression is lost past the ring which relates to dead stick landings, less power, engine won't idle as well, etc. With my rings engine idle better, have higher compression & power, RPM increase, less heat buildup, etc. My rings I make in lots of 10-15 by hand & not mass produced for better quality. All standard rings from 1" bore to 2" bore same price, $10 ea. Shipping per order $4. Email me to place order or send message thru RCU. Thanks Frank Merry Christmas to All.