The elastic bands are a bit fragile but the good thing is you can order some spares for a few cents (literally).
This is the second I have purchased and I love the clear look.
These lights are one of my favourite products, the design wastes no effort in every aspect.
Plus Bike Light Twinpack
I didn't about the Knog brand of cycling lights until I saw a friend from my recreational bicycle club using them on his bike during a scheduled ride. I checked out Knog and was very pleased from the start. There are various design aspects of these lights that really well thought out, like the integrated USB connector which allows for direct charging into a USB port without the use of the cable, and the magnetic mounts for these Plus model - I can easily install them when getting for a ride and remove them for charging when I'm done. For visibility they are perfect during the day and work well enough around dusk that I have used them on weeknight rides. Highly recommended!