The LycraŽ stretch cap holds nineteen imbedded tin electrodes closely to the subject's head. Electrodes are pre-positioned in the international 10/20 montage, so even novice EEG researchers can minimize electrode placement errors. A ribbon cable (100 cm) with connector fans out in the cap to connect to each electrode. The connector arrangement permits the electrode cap to be easily disconnected from the recording amplifiers, allowing the cap to be fitted in one location and used in another. When the electrode cap is in place, EEG recording gel is injected into each electrode (via a central gel access hole) with a blunt-tipped syringe. CAP-ONLY is intended for use with the CAP100C Electrode Cap Kit. Caps are available in four sizes: INFANT (45-50cm), SMALL (50-54cm), MEDIUM (54-58cm), LARGE (58-62cm). Please specify when ordering. CAP-ONLY EEG Electrode Cap Only CAP-ONLY$395.00Size: INFANT (45-50cm)SMALL (50-54cm)MEDIUM (54-58cm)LARGE (58-62cm) 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).