I just purchased 2 TL40's from OST, and I noticed there weren't a lot of pictures online of them. I have uploaded several close up shots of the mic.
They mic's themselves sound great, I haven't really tested them in the field yet however. The capsule itself is slightly larger than the B6, about a 3mm diameter. The only downside I see is the relatively thick cable. They cable is also fairly noisy as well.
Here are some sound tests. Recorded through Sennheiser G3 Lavs, into a 442, into a Tascam DR-40 Recorder.
Sound Test
Sweet Spot Test