The 90 degree elbows are used to connect tubes at a 90° angle. http://www.zhijusteel.com/elbow/90-degree-elbow/
There is a wide range of low melting alloys available.http://www.wocmetal.com/low-melting-alloys/
An Air Outlet Grille is simply a perforated cover that covers your air vent. http://www.sxcanreal.com/air-outlet-grille/
A manual toothbrush is a hand-held brush made out of hard plastic. http://www.sjzwlplastic.com/manual-toothbrush/
Piano pedals (the levers at your feet) enrich the sound in various ways, opening out possibilities further than the keyboard,http://www.sihaimetal.com/piano-pedal/
