BR31SET Twin Shaft Tempered Steel Badminton Racket Rainbow Set (Set of 6)Now you can buy a rainbow set of the super durable BR31 badminton rackets for your facility. The king of durability award goes to the BR31 badminton racket. This racket is made from tempered steel. Featuring twin steel shafts with a steel frame and coated steel strings. This badminton racket is designed specifically for institutional use where rackets get abused on a daily basis as routine. This badminton racket features an all tempered double steel