Beef gut oiled type HL
They are manufactured in the following lengths:
90 cm in diameters from 0.36 mm up to 0.46 mm;
120 cm in diameters from 0.48 mm up to 1.08 mm;
180 cm in diameters from 0.62 mm up to 1.60 mm (from 1.08 bass).
Other lengths are not available.