The color(s) blue, green, white, gray and black is/are claimed as a feature of the mark.
"61 NSF CERTIFIED SEALING GASKET"
The mark consists of concentric circular rings, the blue center bull's eye having the number "61" in white, a first green ring concentric around the blue ring, a gray ring concentric around the first green ring, and a second green outer ring concentric with the gray ring; around the top portion of the bull's eye logo the lettering "LineBacker 61" in black letters and underneath in capital letters the lettering "NSF CERTIFIED SEALING GASKET" also in black letters.
61 LINE BACKER NSF CERTIFIED SEALING GASKET