The Harvester Muzzleloading patented 50 Caliber Crush Rib Sabots for 45 Caliber Muzzleloader bullets are precision engineered and manufactured in the USA to exact specifications and offer superior accuracy.Features50-packPatented by Harvester MuzzleloadingReduces Loading Friction Up to 50%Operates to Loading Specs of all MuzzleloadersEasy to LoadExcellent AccuracyMade in the USAThis Crush Rib High Pressure Sabots is used with .451-.452 caliber bullet for smokeless and oversized bore diameters.