The wavefront sensor (WFS) for the Large Binocular Telescope is based on a pyramid sensor with a maximum sampling of 30x30 subapertures. In particular the pyramid used in the WFS is a Double Pyramid (DP). This for two reasons: the first is that so doing it is possible to have pyramids with a base angle greeter than the angle of a single pyramid so that athe polishing process is made easier. The second is that it is possible to reduce the chromatic effects that the use of a single pyramid introduces. This enables to work with a larger wavelenght range.