Square-edged aluminium profile with a 20 mm tread surface with anti-slip grooves, which provides greater safety and an attractive finish to the steps. A photoluminescent film has been placed on the visible part of the profile to provide visibility in the absence of light. According to the Standard Test Method for Photonic Luminance of Photoluminescent ASTM E 2073-07, to which the product has been subjected, our LISTELO is able to provide about 4.5 hours of visibility after 10 min of activation at 150 lux.