Helical is the barbed tape for private and industrial use. The difference with other similar products is that the loops are not clipped together in a concertina fashion. 
Razor Ribbon, the registered trademark of Allied Tube & Conduit, is the name that made barbed tape famous throughout the world. Razor Ribbon Helical is the barbed tape most recommended for private and industrial use. It has the same long barb features, but the loops are not clipped together in a concertina fashion, allowing the barbed tape to be installed with a variety of loop spacing options, depending upon the level of security required. 
Tape Material: 430 Stainless Steel 1" wide prior to forming 
Core Material: Galvanized or Stainless Steel. 098" diameter 
Barb Length/Spacing/Offset: 2.5" (+/-. 10") tip/tip 4" on center