3M(TM) Scotchcode(TM) Wire Marker Tape Refill Roll SDR-20-29 Printed wire marker rolls. Printed with numbers "20" through "29". 1 roll of each per box. The SDR Tape can be used for the following applications involving operating temperatures ranging from -40°F to 250°F (-40°C to 121°C): Marking all types of wire and cable including power, control, fiber optic, electronic, telecommunications and instrumentation; Phase identification on large or small gauge wire or cable; Identification of terminal blocks, terminal strips, and wire in panel boards or a piece of switchgear; Automotive applications on tubing, hoses and replacement parts.