I can vouch in these as I have the Zhumell 25x100's which are identical , but as Astroceso says they are BIG and need a sturdy mount , like I have and the views are spectacular ! this is the reason I sold my 150mm f/5 skywatcher refractor , the views thru 2 eyes are much better .
Here is mine on their mount , just to give an idea what is needed. I made the adaptor and dew shield myself.
Brian