CNC precision machined from light weight aircraft grade aluminum, Dedicated Bayonet Type Minimizes flare and ghosting by blocking out stray light Protects your lens from accidental impact and the elements New Version Square Bayonet Dedicated design, with a Metal hood cap, new version: with Metal Cap set Note:Doesn't fit XF23mmF1.4 R LM WR (Mark II 58MM Versions) & XF56mmF1.2 R WR (MKII 67MM Versions)