Excalibur&';s exclusive FireBolt Carbon Arrows are designed specifically to deliver optimum speed and accuracy with high performance recurve crossbows when using broadheads. FireBolt Carbon Arrows feature a flatback (no nock) insert for more reliable string contact, reinforced spines and 4" vanes. PRODUCT# 22CAV-6 NOTE: Excalibur Firebolt arrows do not require the use of nocks and are ready to use as they are supplied, with flat ends. The insert is threaded to allow the use of our T-Handle puller