Don't buy it. According to the title it is BILE. You know, the stuff that comes out of your gall bladder.
Seriously, it is a track bike, it is going to be light compared to a road bike or MTB or anything else out there. You can shave pounds off any bike when you delete gears and brakes and anything else that is not absolutely required to propel the bike. The frame looks to be aluminum from the appearance of the welds. No name of the frame so you cannot tell the brand. Doesn't look spectacular to me, not worth $400. Maybe worth it to a hardcore track cyclist though. It's pretty much worthless outside of the velodrome.