Straightness: 0.004” Spine: 300, 340, 400, 500. Materials: 100% carbon fiber. Jiangsu Toptek is committed to produce carbon fiber arrow shafts, archery arrow, carbon arrow, carbon fiber tube, carbon fiber telescopic pole, carbon pole, carbon fiber plate, OEM custom-made products. we can support shafts for enterprises. Toptek can produce the products according to customers` demands.