Mikewell is quite correct in his description of doumbeks,(darbukah,tabl).
Although I am a had bop drummer, I also make a fair living playing gigs as a hand drummer. I own many middle eastern drums for belly dancers and I own even more West African drums (8 djembes,some dunnunba, sangba.kenkeni, kryin, talking drums, etc.) for playing with a NY based African ballet company.
The heavy caste aluminum drums that you alluded to are usually made in Egypt by Alexandria (I own three of those) and they sound fine, but have a sythetic head very (much like a 1 ply clear tom resonator). I also own a few ceramic doumbeks, one with a goatskin head and two with Remo fiberskins in a fixed mounting (most of these that are around the States are made in Pakistan). I own one rosewood zarb (toumbek) from Persia that has a fishskin head.I have a few other doumbeks, one synthetic made by Toca that sounds great, and others from Morrocco and Turkey that are beautiful but tempermental.
The one that was pictured above is very familiar to me and I believe it is a chrome plated brass drum. They are very nice but are mellower sounding. You can't really tighten the skin as much to get the sharp cracks that you can get from a ceramic or heavy aluminum one, but they sound nice in a small venue with other un-mic'ed acoustic instruments. Some of these thinner brass ones are also fitted with a small tamborine inside just under the head, for a little more atmosphere. If the one pictured has betwen an 8" - 10" head it would retail for just over $100.00 in a major store and you could get one in a deal for about $65.00-$75.00 , so you did well.