Bay window Westfalia louvre windows are operated to open and close the turning section by a big knob, which was made from plastic, but which didn’t withstand time very well. Plastic became hard and broke especially on buses baking in the Californian sun, which have been lately imported into Europe with so many. BBT has now the perfect solution for this problem with these brand new knobs. They are perfect in any way and UV resistant as well! Look and feel like the original, this is the real deal, no compromise!