Looks like basic alum CPU heatsinks from a PC. I've got about 20-30 of them in a cabinet here at work. Rescued from scrapped PC's for recycling the metal.
They would be relatively ineffective as they rely on heat dissipation to air passing over them and unless there is a big delta in temp difference between air and the heatsink very little will happen. A fan blowing across them would help somewhat but you are still limited by the ambient temp at the time.
The only real solution would be a Peltier element and a bigger fan and heatsink.
Have a look at mine and others current experiments in this
thread