This is Microwave absorbing material with plastic coating (both sides) for easier handling. Using non-woven nearly-pure carbon fibers, to achieve both good microwave shielding and high absorption this carbon material is conductive in some forms, and a very good microwave absorber. Application Notes: 1- Double or triple the layers of MW Absorbing Sheet to increase effectiveness. 2- To create a super high performance enclosure, you can combine a layer of this Microwave Absorber material with a layer of a high performance fabric shield such as Nickel Copper Ripstop (available on Amazon). Line the inside of the shield with Absorber. It will scavenge any RF which might leak in. 3- Grounding is not necessary with this material. 4- Minimize repeated bending/flexing of this material Brand new, factory fresh. Priced per foot long. Set your quantity to the length (in feet) desired). Please note: This item is custom cut especially for you. As per our Returns Policy, we do not accept returns on custom cut products. SOLD per LINEAR FOOT. NOTE: If you wish us to cut the material into one foot long pieces, please indicate this in seller notes when you are placing your order! Otherwise your material will arrive in one continuous piece regardless of number of feet ordered. NO RETURN WILL BE ACCEPTED AFTER 30DAYS OF PURCHASE DATE - even if the product has been shipped by a customer!