Super small but nice. Read the measurements CAREFULLY. These are very small. The 3" across is not across the top, but rather the side, which is sort of an oval shape. The 8.3" length includes the stem of the light, So the actual dimensions of the light itself, are 2"x4.5" .. about the size of a 12oz can of beer.
They appear to be sturdy plastic and are simple to put together and turn on. You just have to be careful not to damage the light strip when you remove the white plastic "bulb". Just pull it straight up, after you unscrew it and you wont have a problem. Overall, not bad for the price I paid, which was just under $30 for 12. I knocked off 1 star only because I felt the measurements given were a little deceiving.