Disposable Pre-gelled Surface ElectrodesDisposable Pre gelled Surface Electrodes Stick On (stickies), 11 mm (0. 43") Recording Disc Diameter Option: Red Black White Green, 6 ft. (1. 83 m) Lead Wires, 4 Electrodes Pkg, 50 Pkgs Box (200 Electrodes) Features & Benefits: Pre gelled For Fast, Accurate and Effective Application Excellent Adhesion for Short Term or Long Term Use Attached Lead Wires Are Disposable