look at the new kb Icon pistons...900 series...you will see that they are in the 480 gram range plus 106 pin weight..
JE does not show the pin weight on their web site,,,,,
the new KB pistons are based on a 2.5 inch pin length...reduced from 2.75 pin... JE shows 2.75 pin.....which is going to put the total weight very close to the KB total weight...