- Size: 2 x 20m (40m2/roll), diameter of fibre string: 3-5mm + Size 1: 25 x 25 lines/ m2, single x single; double x single; double x double + Size 2: 36 x 36 lines/ m2, single x single; double x single; double x double + Size 3: 40 x 40 lines/ m2, single x single; double x single;