That's what they say, but the little cubes never did much for me for some reason, even in Amsterdam. Smelled good, but that's about it.
You gotta be careful with hash in Amsterdam. The low quality stuff is called "soapbar" and I've read horror stories of people melting LP records and other interesting objects and mixing it in to create fake hash bars. I think the term was called a "Pakistani headache" for the effect of smoking melted records...