Store › SE-55: Pre-Gelled Electrodes, 50 Image 1 of 1 SE-55: Pre-Gelled Electrodes, 50 $25.00 Includes 50 pre-gelled electrodes with 1.5mm snaps. Disposable. Quantity: Add To Cart Added! Includes 50 pre-gelled electrodes with 1.5mm snaps. Disposable.