I was lucky enough to get them in MITB's lightning sale, so I got them at half price; just under 2 Euros - great value!
They come in a package like shown in my first picture. They were well packaged so arrived in perfect condition.
The MITB website says they're not waterproof (in the Q&A section), but the package says 'water resistant'. I'd guess they'd be safe in light rain. They certainly look like they'd keep the water out.
They don't need any tools to install; there are two slots for sliding onto a spoke and then you just tuck the 'wings' in behind other spokes, ending up with it fitting nice and snugly. But very quick and easy to remove if you want to.