Aw they could be nearly anything, kinda nondescript. They look like they could be stretched a teensy bit, as most 'normal' disc end nosescrews are really flat.
Semispheres (much blacker in non-lightbox)
]http://www.bodyartforms.com/productdetails.asp?keywords=semisphere&button=Search&RecordDisplay=&Filter=Yes&ProductID=6886&index=1
IS Half-domes are great, but they never made them in black.
Discs
http://www.bodyartforms.com/productdetails.asp?keywords=disc&button=Search&RecordDisplay=&Filter=Yes&ProductID=6885&index=3
8g+ (I use these)
http://www.bodyartforms.com/productdetails.asp?keywords=gorilla%20glass&button=Search&RecordDisplay=&Filter=Yes&dwzPage=2&ProductID=8382&index=8
12g+ (slightly flatter)
http://www.bodyartforms.com/productdetails.asp?jewelry=&jewelry2=&jewelry3=&gauge=&gauge2=&gauge3=&length=&brand=Glasswear%20Studios&price=&material=&preorders=&internal=&flare_type=&date=&out=&Sale=&clearance=&Filter=Yes&showall=yes&varrows=213&ProductID=6177&index=124
Yeah, its sale-day, I've been doing some serious lurking on BAF...
Neometal make threadless pieces 18g+ with cab ends, and they're really simple to use.
And GWS (on their website) sell nostril screws from 18g+, SF plugs from 16g+ and they do microflares too.
Also, bullet keepers are great for keeping septums out the way (I wear them in my nostrils too). And if its stretched, silicone is super duper comfy. No painful bashing!