Product Description This is a replacement blanking plate to cover the shockwave slot at the rear of your ATLAS 3.0 or 4.0 helmet. This cover is secured by magnets on either side.This cover is only required if you do not have a shockwave installed. ATLAS 3.0 / AT4.0 Shockwave Cover at Ruroc $3.00 Buy Now Check Price on Amazon Check Price on eBay