4pcs x Bobbins. The magnetic guide can be easily removed and repositioned as needed. Use: Knitting. Foldable Shoe Dryer Shoe Dryer Heater Auto-Off Timing for Boots Sneakers Gloves. Secure Pos itioning: Made from high quality stainless steel and magnets, magnetic seam guide is the perfect choice for edge protection, positioning, and preventing fabric curling.