The Thunderhead replacement blades from New Archery Products are the ultimate addition to your Thunderhead broadheads and are introduced in 18 pieces in a pack. Features of the Thunderhead replacement blades from New Archery Products: - 18 blades in 1 pack; - Works for Thunder head 100 and 125; - Diamize sharpened blades. The Thunderhead replacement blades fit the Thunderhead broadheads 85, 100 and 125 grain options which are widely recognized as the finest fixed blade broadheads ever created available in 85, 100, and 125 grain options. One of the sharpest blades in the industry for massive hemorrhaging and knock down power of the NAP Thunderhead set and designed for ultra fast bows and crossbows. The fixed blade construction of the New Archery Products Thunderhead broadhead set is strong and tough enough with less chance of malfunction to ensure quicker kills. The Thunderhead broadhead blades set from NAP features 1 1/8” cut diameter for 85 grain option and 1 3/16” cut diameter for 100 and 125 grain products.