These snap electrodes provide the same signal transmission as the reusable electrodes, with added convenience and hygiene. Each peel-and-stick electrode is pre-gelled and designed for one use only. EL503 electrodes do not contain any latex. Use disposable snap electrodes with the LEAD110 series electrode leads. For best performance, use the LEAD110S-R and the LEAD110S-W shielded leads for your recording electrodes and the LEAD110 unshielded lead for your ground or reference electrodes. These economical, pre-gelled electrodes have a circular contact area of 1cm diameter and are most suitable for short-term recordings. The small (35mm) diameter backing allows close electrode placement where necessary, and a slightly less firm adhesive allows "ouchless" removal. The electrodes incorporate liquid gel and are high chloride for quick, accurate readings. Quantity: 100. (Available at a discount in quantities of 1000. See EL503-10.) EL503 General-purpose Electrodes for ECG, EEG, EMG, EOG (Pkg. 100) EL503$35.00 Same Day Shipping - orders with UPS Red or Blue shipping will be shipped the same day if received by 3 p.m. PT (Monday-Friday).