Hi all,
my friends recently bought me this tree but did not bother to ask what kind of bonsai it is. I did narrow it down to hornbeam or beech but I am not sure. Maybe it's not either one above. Anyway if someone has a clue I'll be grateful for an answer.
Thanks

There is no such thing as a bonsai species, you are looking for the tree species. Try the species guide, top of the page. It is easy to recognize,

Thanks,
sorry I didn't wrote bonsai "tree" species, didn't know it will be an issue, I checked my post and I wrote that I did narrow it down but I'm not sure. Thanks anyway for your time to partially read my post and write a long unhelpful reply.
Martin

Sippi wrote: .., write a long unhelpful reply.

Martin, it was not unhelpful.
Yours is perhaps THE easiest tree to identify, there is a whole section in this site just to help you find it (as Auk pointed out), and learning how to identify plants is a fundamental part of this bonsai process. If you really care for bonsai, you will have to learn quite a few things, it's fun!

Thanks again,
I was just saying that I like people that find the time to respond to a post but don't write anything useful not unlike you. Sorry but I see it this way. I said I'm not sure so please just be so kind write what it is. Thanks
Martin

Both your guesses are wrong. Have snother look in the species guide. Watch the leave shape closely.

So it's an elm. Hopefully....
Martin

Seems to be a Chinese elm (Ulmus parviflora) tree
ID my bonsai: www.bonsaiempire.com/tree-species/bonsai-identification
Guide: www.bonsaiempire.com/tree-species/chinese-elm