1. Stainless steel tape measure, all metel parts in this tape measure are made by stainless steel, it well used in water environment and antirust, then it improve the use life for normal tape measure.
2. Nylon coated blade --- which use life is 7 times as normal blade.
3. There is 4 speci. as 3mx16mm, 5mx19mm, 5mx25mm and 5.5mx25mm.