https://www.ebay.com/sch/i.html?_nkw=Accumulair+Fmrcbp48X216X+5+X+18Ft+X+0+5+In+Carbon+Media+&_sacat=0&_dmd=2

Accumulair Fmrcbp48X216X.5 X 18Ft. X 0.5 In. Carbon Media,

Regular price
$132.00
Sale price
$84.00

Carbon media naturally fluctuates during the manufacturing process. Typically this fluctuation will be anywhere between 15% to 20% of the product base. Therefore, carbon medias have to be measured, at a minimum, over a large area with a micrometer using a 1 foot. As a result, carbon rolls come in a nominal thickness and an actual thickness. The actual thickness will vary from the nominal thickness due to factors such as the manufacturing process, how tightly the media is compressed, the tension