Sliding Hook Flyer Joy with Sliding Hook Flyer bobbin Lacquered A sliding hook flyer kit including 1 bobbin is now available as a retro kit for all existing Joy Spinning Wheels. Fill the bobbins evenly with the squeeze-and-slide stainless steel hooks. Graphite fibreglass arms make these flyers light and strong. New sliding hook flyer bobbins hold up to 30% more yarn. finish lacquered orifice 1cm (⅜”) included accessories – 1 sliding hook flyer bobbin lacquered – nylon brake band – 2 tension springs with 1 closed cup hook – replacement top shaft in case your new flyer does not thread easily or fully into the current top shaft (for older joy wheels)