No difference from traditional rings?Apart from 2 stupid lugs on them thats the difference.Why do you think the traditional rings where made perfectly round.Its to stop them catching on things.The new rings will smash eggs injure ybs in the nest and many birds will get broken legs from them.If the RPRA is not going to cater for traditional clocking methods theres no point being in it.Not everyone has the money to set up ets