These top notch high quality carbon fiber main blades produces maximum lift with minimum drag. They are designed thinner than the stock carbon fiber blades and are slightly longer to bring more stability to 300 size helicopters. The blades come with 4 precision aluminum washers to accomodate different types of blade grips, ranging from 5.2mm to 6.0mm main blade grip thickness. This is to allow a perfect fit on both E-flite blade grips and MicroHeli CNC blade grips MH-CP002BGP and MH-CP002BG. This high quality carbon fiber main blade set brings better performance to the E-FLITE Blade CP/SR/PRO/PRO2 helicopters. Length = 250mm