It doesn't seem to fit with an adapter on the mi 3-4 and mi 5-6.
That is, it is not exclusively for the specific mi that was ordered.
Anyway, the application is flawless.

It's great, very good. I've had it for sure for a year, maybe two. It has endured full water exposure, the clasp hasn't broken, and the "leather" hasn't worn out - I'm not someone who takes care of their straps, so it's good. However, if you have skin issues in the summer with water and sweat, the material will cause breakouts and such. It doesn't cause anything in the winter, but it's unbearable to wear in the summer.

Absolutely satisfied so far (one week of use). What I didn't see mentioned anywhere is that in order to attach the BAND 4 with the strap, you need a rubber band which is included and even has a second one.

It's worth its money if you want something classier than a silicone strap, it gives a different feeling. Good fit (I have a fairly wide wrist) and had no issues so far with water contact.

Honest, it is what it says.
Makes the band look more premium and more like a watch.
Very easy to install the MiBand4.

The strap is beautiful, convenient, and easy to put on and take off. However, I do not recommend it for people with skin problems. I have dermatitis and it has caused redness and itching on my wrist.