just for the record... the coilpack CG10 rings are slightly different to pre-coilpack CG10,s too 
and the piston top ring land is narrower (more suited to N/A than forced induction methinks)
edit, they are a fair bit lighter too
http://www.micra.org.uk/attachment.php?attachmentid=12427&stc=1&d=1238447225
http://www.micra.org.uk/attachment.php?attachmentid=12428&stc=1&d=1238447225
