The CASEBUDi hard case fits pretty much all of Sennheisers low to mid range over ear headphones so snugly, you would think that it was manufactured by Sennheiser itself. I use this case with my Sennheiser HD 439's and it works like a charm. The only issue I see is that the cable on the HD 439's has to be removed in order for the headphones to fit in the case. With other Sennheiser HD 400 series headphones (like the HD 419, 429, 449's etc.) this could pose a problem because these headphones do not have a detachable cable function. Otherwise the CASEBUDi headphone case fits the Sennheiser HD 518's, HD555's, HD 598's all the way up to the Sennheiser HD 650. Pretty much any full sized Sennheiser headphone between the HD 439's and the HD 650's that have a detachable cable will fit as perfectly. The case also includes a little zippered pouch inside that is useful for storing cables or in my case, the rubber band and 3.5mm jack for my portable headphone amplifier. This case has velcro on the back so it can be moved around inside the case to different positions. This inside of the case is also very nice, it feels like it is covered in a soft, felt-like material.
HD 439's and accessories fit snugly in the case
As you can see in this picture, the Sennheiser HD 439's fit very well inside the CASEBUDi hard headphone case. I can even store my FiiO E7 amp, its accessories, the headphones themselves, and the headphones cable (which is in the black Sennheiser pouch) all inside the case. This case is a great alternative to the cheap, bag cases Sennheiser supplies with many of their headphones. In my case, the HD 439's didn't come with a bag or a case, so this hard case was practically a necessity! The CASEBUDi headphone case is durable and will surely protect your precious Senns from a variety of accidents such as liquid spillage, drops and of course, being sat on. The case is constructed very well and the zipper is of high quality operated very smoothly (its not one of those crappy zippers that gets stuck all the time). I definitely recommend this case if you have a pair of Sennheisers that you travel with a lot and you want added protection for. Especially when transporting some of the more expensive headphones like the HD 598's and HD 600's, this case is worth its weight in gold. There have been reports by reviewers that this case also works for other headphones such as the Parrot Ziks, but you would need to do more research before buying this case to see if non-Sennheiser headphones will fit. Five out of five stars goes to the CASEBUDi hard headphone case!