4mm 50m Round Wire for Garden Trimmers The grass trimmer line is made of nylon surface and steel core, rough and not-easy to break; Durable material resists wear and tear Thick diameter of this trimmer line: 0.095''/2.4mm. Length: approx. 164ft/50m. Round profile Replacement mowing line for filling thread spool, for garden trimmers This is just a grass trimmer line. Please wear full protection gear and strictly follow the user's manual of your trimmer & trimmer head when using this line.