NIKOMED PACEMAKER / RESEARCH EKG ELECTRODES (5520) - Dual-Snap Design provides excellent duel monitoring from just one sensor site. Perfect for pacemaker checks and research. Save time and money; use just one electrode in place of two. Super-tack adhesive for superior contact. Foam, Solid Gel, Size: 32mm x 45mm. 300/BX. Price per box.