The Visaton WF 130 ND - 8 Ohm is a 13 cm (5") bass / midrange driver with polypropylene cone, neodymium magnet and rubber surround for applications where only a very low installation depth and low weight are possible.
The good sound in the bass and midrange is not impaired. A grille in front of the loudspeaker is not necessary, as the fabric-covered basket front protects the otherwise exposed air gap and oscillating pulses.