BR21SET Rainbow Badminton Rackets With Coated Steel Strings (Set of 6)When you're shopping for badminton rackets to use in a school facility it's important to consider longevity. Standard badminton rackets have nylon strings that offer good action but they are easily stretched and destroyed with heavy use. These rackets are made using coated steel strings which will last much longer. They will not provide the same play ability as high end rackets but for institutional use the normal user will not notice the difference