The society has received confirmation from the RFU that the new “Smart Power” studs present no greater risk of injury to another player than the stud/cleat shown in World Rugby Regulation 12 Schedule 12. Therefore, they can be allowed providing that in the referee’s opinion, they are in good condition and that wear has not made them unsafe – for example, edges have become sharp.
See photos below for more information. The studs currently retail at around £25 for a set of 16 so they are not cheap. The marketing blurb claims they are worn by England’s Joe Marler and Ben Franks of the All Blacks.