Check the listing for details. Line Stroft GTP Typ R Woven 100m Red. Color: Red, Condition: New. Listed at 36.18 USD. Line STROFT GTP type R: Type R is the tried and tested GTP, which was previously offered in strengths Type 1 to Type 12. These strengths are now called Type R1 to Type R12. The R stands for round and tight. Last year this series was expanded to include types R01 to R06. These are extremely fine cords with a diameter of approx. 0.06 mm to 0.13 mm with load capacities of 1.5 kg to 4.0 kg. Type R is manufactured using very special braiding processes. The STROFT special braid made of, for example, 300x8 = 2400 individual fibers (type R12) creates an almost circular cord cross-section with an arrow-like dimple on the surface. These Dimples Dimples (dimples) create turbulent flows during the throwing process, which reduce air resistance and thus enable further throws, as is the case with the dim.