String features an articulated arm constructed from extruded aluminum. The arm is balanced by an elastic cable sheathed in synthetic coloured fabric, from which the lamp also gets its name. The base of the table and floor lamps is made of aluminum, with cast iron ballast. The adjustable head, made of moulded plastic, is easy to handle thanks to the central hole. The touch-sensitive switch controls a LED light source.
In the String DTW version, a new LED dim-to-warm electronic technology has been used. The switch placed in the lamp’s head controls light quality and adjusts, according to activity performed and time of use, the light’s luminosity and correlated colour temperature, from 2500K (warm light) to 4000K (cool light).