Yonex World #1 Badminton Racket-- Used by Lin Dan, Lee Choung Wei and many top rank players. Yonex Racket 1yr Limited Warranty only cover Manufactory Defect Only. Racket returned for warrenty inspection must be returned as is, with the string intact. (don't cut off the string or take out the string from the frame). One Piece stringing and over the facotry max tesnion will void the warranty.