Carbon Express Type 1 Inserts - 12 Pack Knurled to increase the surface area for better adhesion to carbon shaft wall. Fits: Aramid 250 and 350, all Maxima and Maxima Hunter except 450, all Mayhem and Mayhem Hunter, PileDriver 250, all Mutiny, along with Predator II 4560 and 6075 shafts. Press-fit for perfect alignment. weight: 11 grains Price is per dozen.