What type of cutting line should I use with the GL350?

Use only the appropriate type of cutting line for the GL350. The recommended replacement spool is model RS-350 from BLACK+DECKER with 2 X 2.7m (8.8 feet) of nylon line. Never use metal cutting lines or wire. The cutting line diameter should be 1.65mm (0.065 inches). (Page 10-11)