I've purchased other insertable electrodes, and was relieved to find this one to be a manageable size and length. Once attached to the leads, they stay in place. All of the edges are very smooth, so there's little risk of causing damage - the only reason I didn't give a 5-star rating is because the probe doesn't have the means to attach a cord, or a flared edge at the bottom. With prolonged play, the probe could sink too far and be difficult to retrieve, so the cords with the offset plugs would probably be the smarter choice for use with this device.
Works very well with the Pebble, and various sounds if one is into play with multiple devices simultaneously.