These are rubber wheels which can be used for small robot applications. These are inexpensive and good for proof of concept projects. The wheels are made up injection molded plastic with rubber tyres. The plastic is designed to give the wheel maximum strength and the rubber gives the wheel its grip. These can be used in either two or four wheel drive mode.
Specifications
Diameter: 55mm
Inner diameter: 51.3mm (tightly fitted with 3mm shaft)
This LTE Cat 1 modem is like a wizard for your IoT stuff. It makes things super easy to connect and goes zoom-zoom with its super-fast speeds. And hey, it's got some fancy security stuff too, so you can sleep easy at night. Plus, it doesn't gobble up power like a hungry monster, so your devices last longer. It's small and mighty, a real game-changer for any IoT adventure. Totally worth checking out, trust me on this one!