Plastic, but really sturdy. Magnetic. Very pleasant sound. Loud for some, but for me it's absolutely great. Like two pebbles knocking together. The rotary knob is great too. If the HE keyboards are on sale at Alza, I think it is the best possible choice for the money. And at full price, quite possibly too. But it's far from perfect and some of the mistakes probably can't be excused except by the low price tag, so although I really hate to, I'll have to be a bit negative. In short, two major issues - Rapture's companion software and the backlight. The software is rather untidy and untuned, so be it, but above all it can't do a lot of things that I somehow automatically assumed it would be able to do. Macros and keypath settings fine, no problem here. The rather limited key mapping is no longer fine. You cannot map key combinations other than Fn + key, many additional keys cannot be assigned at all (so no e.g. Shift + F1-F12 for F13-F24). In addition, some key combinations are fixed and cannot be changed. I don't understand why. Fn + rotary knob cannot be remapped at all. In addition, the software does not offer mapping of such basic functions as changing the backlight intensity. There is a predefined shortcut for this, but I can't set my own. So is the stupid on/off backlight. The range of system functions available for assignment is very limited. All this is not something that can't be solved with PowerToys and/or AHK, but it's a bit cumbersome and probably not for everyone. One last thing about the software - Rapture, I don't know why, doesn't have it unified. I also have a mouse from them, but it has its own program (and probably only for the Cobra series). So I have two identical icons in my sys tray and I don't know which is which. An even more absurd thing would happen if I accidentally get a second keyboard from them, for example Charlie, which I am looking at, then I would have three Rapture utility programs. Second thing, the backlight. First of all, the original keycaps are fine, but the font is not translucent. I don't blame anyone. However, I got the keycaps from Geekboy and they look very good on the keyboard, I would say. Unfortunately, if one does not have a keyboard called. "under the chin", but a little or more in front of you, the backlight suddenly looks sharp. Unfortunately, it is worst at an angle of about 45°. The harsh light shining from the switches through the gaps between the keys is simply in your eyes. The worst is the bottom edge of the F series, which can be really annoying. And even if someone doesn't mind or uses a lower intensity backlight, it just doesn't look very nice. It looks uneven and cheap. Although I've never had this problem with cheaper high profile keyboards, I honestly don't know if there's anything that can actually be done about it with the backlighting method I've chosen. On the other hand, if one looks at the keyboard vertically, the backlighting is very even and very nice. But honestly, I don't know anyone who has been typing on a keyboard for a long time with it, say, 10-15 centimetres from their chest. I'll think about a DIY solution, but I honestly don't know if I can think of anything. I will add that the problem is also with the original keys, it is not a result of keycap replacement. Finally, the color coverage of the LEDs is sometimes quite inaccurate compared to what color I set. And even with a smooth color transition setting, the color change is actually more of a jump. In my opinion, all of this indicates that significant savings were probably made in this respect. Still, for the price, it's a really good buy for me, and I believe that a lot of these things won't be an issue for many people at all.