The Yonex Isometric TR-1 is meant to take your game to the next level by strengthening your arm. It does this by over doubling the weight of an average badminton racket @ 118 grams. This racket also comes with a removable semi-mesh head cover increasing wind resistance while still allowing a natural swinging motion. This racket is recommending to players of high school age or older; HOWEVER, it is suggested to not use for longer than 20 minutes at a time even for full grown adults. Recommended For: Intermediate/Advanced/Competitive/Elite level player that favors an attacking style Among the best choices on the market for training rackets. Characteristics: Excellent for developing smashing power, drive, and stability Factory strung High quality fit & finish - Made in China Flex: MediumFrame Composition: GraphiteShaft Composition: GraphiteJoint: Built-in T-JointExtra Length (mm): 10Weight & Grip: G5 (Avg. 118g)Tension Range (lbs): 20 - 30Color: BlueMade In: China BadmintonDirect.com is an authorized dealer for Yonex Badminton, and all Yonex rackets come with a 1 year warranty against defects, if you encounter any issues during this period please email us at [email protected] and we will be happy to assist you. *Stringing above the manufacturer's recommended tension can compromise the integrity strength of the racket frame. Therefore, will void the manufacturer's limited warranty.*