Four sets of numbers 1-22 are made of baked-in number legends that won't fade.
Each set of numbers contains thee markers (strip of 4, strip of 2 and strip of 1) and will legible mark wires down to 0.040" (approximately #26 guage insulated) and up to 0.350" diameter cable with a full wrap.
Graduated strength perforations let you use just the end section and pull away the remaining strip for subsequent use. To mark a terminal, press the bottom number section in place with your finger or a pencil eraser, pull up and the marker will cleanly separate. The remaining two marker sections can be used on one or two separate wires as needed.
The marker adhesive is especially made to bond with vinyl wire insullation. Adhesion increases with time.