Caprolactone Thermoplastic - tongue-twisting mouthful of chemicalness. But this stuff is cool! You have to heat it up to work with it. Paradoxically, it still very cool, believe me.
This is a 9V battery pack with on/off switch and a 2.1mm barrel plug, you get both parts and will have to solder them together. Use this to battery-power your Arduino (or other electronic projects).
This is a really nice power supply. It's a switching DC supply so its small and light and efficient. It is thin so it fits in power strips without blocking other outlets.
Male Strip - 12 per Strip, gold flash on 2mm spacing
It's a nice quad-AA battery holder, with 6" leads.