The RFM69HCW is an inexpensive and...
The RW2i rubber wheel features an internal set screw ideal for designs with space constraints. The 1.1-inch diameter wheel by Solarbotics is made for 3 mm diameter output shafts. These wheels are sold individually, NOT in pairs.
Charmed Labs Pan/Tilt Kit for Pixy 2 CMUcam5 Image Sensor
These laser-cut Lexan parts and nylon standoffs make a nice Biped hand. It can be used for a Humanoid Biped or any project that needs to get a grip.