Replacement flyer arms for SpinOlution spinning wheels, sold as a matched pair. The flyer arm is the wooden member that holds the hooks or pegs along the length of the flyer; arms wear evenly through repeated use, so SpinOlution sells them as a pair to keep the flyer balanced after replacement. They're also keyed to only go in one orientation. Choose Your Capacity Flyer arms are shared across SpinOlution wheel families. The same physical pair fits any SpinOlution wheel that uses a flyer at that capacity, so capacity is the only choice you need to make. 4 oz: fits the Pollywog, Echo, Monarch, Firefly, and Queen Bee. 8 oz: fits the Echo, Monarch, Firefly, Hopper, Bullfrog, and King Bee. 12 oz: fits the Pollywog only. 16 oz: fits the Echo, Monarch, Firefly, Hopper, Bullfrog, and Worker Bee. 32 oz: fits the Echo, Monarch, Firefly, and Hopper. 64 oz: fits the Monarch and Firefly. When to Replace Flyer arms can wear or break from repeated yarn contact along the hooks, accidental drops, or normal long-term use. Replace both arms as a pair even if only one shows visible damage, since matched arms keep the flyer balanced during spinning. About SpinOlution SpinOlution spinning wheels and accessories are designed and crafted in the USA. Browse the SpinOlution collection for the full lineup.