The Sponstim electrodes are sponge-based electrodes suitable for any type of transcranial current stimulation (tCS), including tDCS, tACS and tRNS, with Neuroelectrics® Starstim. It is available in three different models that vary in shape (circular or rectangular) and/or in area (25, 8, 5x7 cm²). The circular model with 25 cm² and the rectangular model with 35 cm² provide a comfortable and reliable contact, which is ideal for bipolar (anodal or cathodal) experiments. The smallest Sponstim model, with a circular area of 8 cm², is the optimal solution for multi-electrode tCS. All models must be used with saline solution. Sponstim is not intended for EEG recording.