This is a Vandoren TL5 tenor saxophone mouthpiece. Compared to the T20, it has a thicker beak and gives the impression of a soft sound with a core. I've played about three TL5s so far. The TL series seems to have significant individual differences, with some producing a buzzy sound or excessive resistance, but this one is a good piece, with less buzz and moderate resistance. I was torn between the T20 and the TL5 and used both for a while. Now that my tenor setup is settled, I'm putting this up for sale.