The Premium Grade Duct Tape (#350200) is 14 mil, with a high tack, natural rubber adhesive. The duct tape provides excellent seals and seams. It is waterproof and extreme-duty duct tape.
The Professional Grade (#350205) is 10.2 mil thick for durability and is a high quality, poly-coated duct tape. Waterproof and tear resistant. Has an aggressive adhesive that bonds to most surfaces.
The Multi-Purpose Grade (#350207) is an excellent general duty tape. A good choice for many applications. Has an aggressive natural adhesive.
All three types measure 2" x 60 yards.