Our suggestions are below. You should use the whorl that helps you get the yarn you want. Sampling is always a good idea.
Our Extra Slow Speed and Slow Speed Whorls are excellent for thick, low-twist yarns, and useful for novelty yarns. A longer drive band may be needed when the slowest whorls are used.
Our Medium Speed Whorl (included with Ladybug, Matchless, and Sidekick wheels) is good for medium diameter wool fibers, flax, and some silks. It is good for plying.
The Fast Speed Whorl (included with Ladybug, Matchless, and Sidekick wheels) can be used with fine, short staple wools, angora, line flax, silk and cotton.
Our High Speed and Super High Speed whorls are excellent for all finer fibers, especially when a fine, high-twist yarn is desired. A High Speed Bobbin should be used with these whorls when spinning in double drive on Ladybug and Matchless wheels.
The Extra Slow Speed whorl is not recommended for use with the Sidekick Spinning Wheel. Because this whorl is so large, there are issues with the fit on the Sidekick.
If you don’t know which whorls you have, download this ruler to help measure your ratios.