3M 35-GY66 35 TYPE GRAY SLATE TAPE FOR COLOR CODING .75 X66FT 80610834063 NEW 35 Identification Tape is used for identifying special applications. It is available in blue, orange, green, brown, gray, red, violet, white and yellow. It is available in two sizes: 12.5 mm x 6.1 m (1/2" x 20') and 19 mm x 20 m (3/4" x 66').