Mouthpiece, White PMP Plastic Resin, Lightweight

This is a mouthpiece with nothing written on it except PMP, and the manufacturer is unknown.
I couldn't find the same one anywhere by searching online.
It might be a non-sale item.

It has been thoroughly disinfected with alcohol.

Below is a quote from another seller's description of the same item:
The inner diameter is quite large and the cup is deep.
It's even a bit larger in inner diameter than a Bach 3C. When used for mouthpiece-only practice, it's light, won't break if dropped, produces a good sound, and transforms into quite a remarkable item.
Thank you for looking.