This gear kit contains 60 kinds of 0.5 modulus gear, the gear shaft 102A which there is copper gear, also the 2.3MM and 3.17MM gear included, some rack, worm and belt may you need too. Gears are made of ABS plastic and meets DIY requirements.
This Micro USB Breakout Board offers easy access to all the USB power and data pins as they are connected to large solder-able pads on the PCB with 0.1" spacing.
3V Vertical water pump is a kind of DC micro submersible pump. Equipped with male and female Dupont line connectors, it can apply to the fountain used in many situations with much convenience.