1 Set x OXY4 - Main Blade Shim Silver = 0.5mm thickness1 Set x OXY4 - Main Blade Shim Black = 0.6mm thickness1 Set x OXY4 - Main Blade Shim Red = 0.75mm thickness1 Set x OXY4 - Tail Blade Shim Silver = 0.5mm thicknessThese shims make it possible to use:Main Blade with Root from 4.5 to 5mm (Main Blade from 305 to 362mm Different Brand)Tail Blade Carbon Fiber 60 to 70mm with Root 2.5 mm