Aerodynamic design creates less resistance generating less noise 1.Aerodynamic design creates less resistance generating less noise2.Four cutting edges woven throughout the line, produces a streaming air flow for cleaner,smoother cutting.3.Fits all standard trimmer heads4.Long lasting co-polymer material.5.Shape:Round,square,star,heptagon,hexagon,twist,trigon6,diameter:1.3mm-4.0mm(.050in-.155in)7 ...