Total Carbide Brushcutter Blades Safety & PPE Barricade Tape Size Age weight Calf Circumference Small 80323 Size Age weight Calf Circumference Small 4 7 Year Old Person 6 to 9 inch circumference calves Medium 50 110 Pound Person 9 to 14 inch circumference calves Large 110 200 Pound Person 14 to 18 inch circumference calves X Large 180 250 Pound Person 18 to 23 inch circumference calves XX Large 250 350 Pound Person 23 to 30 inch circumference calves XXX Large 350 500 Pound Person 30 to 36 inch circumference calves Solid Color Snake Guardz snake gaiters are FR and are tagged as follows: always inquire as to what ASTM or NFPA test regiments are required for the end user application These carbide brushcutter blades will last 30 times longer (or more) between sharpening than conventional brushcutter blades durable tungsten carbide tips provide excellent cutting performance and durability