The Renzetti Hair Stacker is available in Midge, Standard, and Magnum sizes, providing versatility for all fly-tying needs. Each size is designed to quickly and efficiently align hair tips, ensuring fibers are uniform and straight before tying. The tool works with delicate midge fibers, medium-sized hairs, and larger fly materials, giving tiers precise control and consistent results regardless of fly size. Its ergonomic, easy-to-use design and durable construction make the Hair Stacker an essential accessory for both beginners and advanced tiers seeking professional-looking, balanced flies every time.