X-carriage mount assembly for Prusa compatibles, e.g., Anet A8, A8+.
 
Yellow is 8mm shaft
White is 10 mm shaft.
 
Uses lightweight carbon fiber for shafts, replacing heavier steel rails that are standard. Carbon fiber rails are stiffer than original steel.
 
Available options: 
Without shafts
8 mm shafts, 1 mm wall
10 mm shaft, 2 mm wall