Definitely glass, with a gasket, Bosch part I believe. Nice! I suppose since only half the 202s have replaceable lenses, and that they are later models, this hasn't come up for replacement for many people. One of mine has a rock-hole, and oddly enough, after it got washed-out by the rain, it's very clear, making the other look dingy. Good cosmetic refresher for $130 a set!

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL