Silver Duct Tape 2" x 60 Yards 6 Mil Thick Box Shipping Heavy Duty Tapes 24 Rolls Per Case Superior, Durable Backing. Color : Silver, Total Thickness: 6 Mil. Can be used for General maintenance. Standard 3 core diameter - common size for most tape dispensers. Aggressive Natural Rubber Adhesive and Repair for Construction or Waterproofing.