Grim Reaper Practice Head 100 gr for 1 3/8 in. and 1.5 in. Broadheads (3 pk) Review Posted on July 12, 2018September 23, 2018 By WriterTwinklePosted in Arrows and PartsTagged Archery, Grim Reaper Broadheads, Hunting & Fishing, Sports & Fitness, Sports & Outdoors Non-opening, perfectly matched practice heads. Same aerodynamics and flight trajectory as broadheads. Do not hunt with this head.