"The Trophy Ridge Whisker Biscuit Power Shot Arrow Rest uses the Ballistix CoPolymer System for weight and vibration reduction-as strong as aluminum, but a full 25% lighter! Other features include precise windage and elevation adjustment with reference marks and custom rubber boots silence arrow loading. Designed for use with left- or right-hand bows. Ballistix CoPolymer System Precise windage and elevation adjustment with reference marks Custom rubber boots silence arrow loading Designed for use with left- or right-hand bows Biscuit Size Arrow Sizes SMALL (0.300"" inner) TROPHY RIDGE, ACC, OUTSERT CARBON, AXIS 17XX or smaller ALUMINUM MEDIUM (0.320"" inner) INTERNAL COMPONENT CARBO, 19XX or smaller ALUMINUM LARGE (0.385"" inner) 23XX or smaller ALUMINUM FISHING (0.360"" inner) UNFLETCHED FISHING ARROWS ONLY"