An extra set of 4 magnets available as an optional accessory. They can be used to fix the fabric more securely to the hoop when not using adhesive stabiliser. Suitable for all metal hoops. Note: No more than 8 magnets can be used at one time. CAUTION: MAGNETIC FIELDS CAN BE HARMFUL TO PACEMAKER WEARERS. PACEMAKER WEARERS STAY BACK A MINIMUM 12IN. (30CM).