Carbon arrows have different sizes and accessories .
0.244-0.246" ID 6.2mm 0.202-0.204" ID 5.2MM 0.300" ID 7.62MM 0.315" ID 8MM 0.166" ID 4.2MM
Straightness ；Normal straightness is less than 0.006 ,0.001;0.002 and 0.003.
Different materials:imported pure carbon ,Chinese carbon .mix carbon ,3k carbon .
Mix carbon and chinese carbon usually are used for hunting fishes and practice.
Pure carbon are for archery shooting and hunting ,even competition.If you prefer very top quality arrows,maybe you can have a try of 3K carbon .This is very top quality with good feedback for professional archers.