We say:

The RH-300 headphones are Roland's top of the range headphones, offering super sound quality for a broad range of applications. We have found these headphones to be particularly suited to higher end study, perhaps for use in BTec or A level music technology courses where students are required to really listen hard to their performance or composition work and engage with more detailed music production techniques. 

Roland say :

Roland's top-of-the-line headphones for the ultimate in sound quality, appearance, and performance. Optimized headphones with flat, accurate sound quality for the latest electronic digital musical instruments. Newly developed 45mm driver with neodymium magnet offers full dynamic range and stable output, even on large input surges. Classy appearance with aluminum housing plate. Soft earpad provides comfortable listening for prolonged periods.