CAC Custom Printed Arc Trooper Havoc Helmet with blue markings.
kevinmboots77 on flickr (Submitted on 14th Apr 2013)
Bought this for a custom clonetrooper I have. Perfect fit, has the right sized for the standard Lego range finder. Feels like an actual Lego helmet too. With all the option you have to choice from, you can't go wrong.