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The OpenBCI Ultracortex Mark IV EEG Headset has adjustable electrode bolts to adapt to different head shapes. Some heads are a little outside of the average curvature and may need a longer bolt to make proper contact with the scalp. The STL's for various alternative parts are available on the OpenBCI GItHub. For those who need a long bolt but don't have a 3D printer, you can order it here from Shapeways.