... SMASH POWER 100 Carbon one piece Badminton racket,Material: carbon fibre hitting area: 55 square inch string tension:24-26pounds ... Aluminum carbon one piece badminton racket,Material: aluminum alloy/carbon fibre/steel shaft hitting area: 54 square inch string tension:20-22 ... A-B-11 Aluminum alloy badminton racket,Material: aluminum alloy/steel shaft hitting area: 54 square inch string tension:18- ...