Set of 8 pistons. Couldn't find any markings on them, but ran one of the part numbers on the box (1479H 030; the other one was partially unreadable), and compared the listed specs on Summit and they seem to jive, although it is a Keith Black description. These were part of a stash of parts, so I don't have any more info, sorry. .927 pin 1.540 compression 4.023 +/- bore Feel free to ask any questions; shipping extra.