Bowcore Premium Serial Field Points are the best arrow points in Archery industry, We make them by Japan Swiss Type CNC Lathes, one processing to produce (including screw). Bowcore Premium Serial Field Points are made by SUS 303 Stainless Steel. The tolerance of weight can be holded in +/- 0.5 grains by 100 grains, No edge, No stains. Fits Multiple Arrow shaft Sizes perfectly.