They are made of plastic covered with a film or second generation reflective face has a size 25x100cm.
U21 pillars are intended to mark the edge of the narrowed lane, busy or too low (over-) shoulder, emergency lane, or in the case of dividing the narrow belt. U21 pillars are made of plastic in the form of "barrels" bilaterally or unilaterally covered with reflective foil. Mounted on the bases they have the ability to mount lamps single or light wave.
length - 134 cm
Width - 29 cm
thickness - 6 cm