Depending on the needs, solid acrylic letters can have opaque front or sides . Also, the light can be direct and / or lateral and alternatively reflected. They are made with aluminium understaff fixed on the back of the PMMA (not visible on the front). The solid PMMA is worked to contain the understructure and the LEDs, while the sides can be polish or satin. The letter signs in solid acrylic are an ideal solution for letters and logos with a height between 7/35 cm and a luminous thickness from 2 cm to a maximum of 3 cm.