Schacht Pirns are specifically designed for use with Schacht End Delivery Shuttles, providing a smooth, effortless yarn release for an efficient weaving experience. Made from lightweight and durable plastic, their tapered shape allows the yarn to unwind evenly without added tension adjustments. Available in two sizes— 6" for 12" end delivery shuttles and 8" for 15" end delivery shuttles—these pirns keep weaving fast and precise. They are best used with a double-end or electric bobbin winder for easy winding and optimal performance.