378 sq. in. of insulating fibroid Fish Paper. Ideal for All Electrical Insulation. 1  Pieces very Dark color with adhesive backing or PSA. Measures 18" length x 21" width x 0.020" thick. Excellent for hobbyists and small item repairs who need a thicker paper than the 0.010" thick standard. Color of Paper is as shown - Dark. Spec Sheet available on request. Please note this is Dielectric Fish Paper designed and manufactured for electrical and telecommunications applications. Paper without adhesive backing or Pressure Sensitive Adhesive (PSA) is offered in another listing.