I made this for the bike keys of my daughter. 
As seen its a small Flash to attach to the key with a ring.

I have them in daily use on 4 Keys for 2 Bikes all printed in PLA and none has broken of so far.

~~~~Update~~~~

As this Model was more popular i made a V2 version. 
We also got a new Yellow bike so i wanted a matching flash for our new Familly Bike. 

Changes:
- 15% bigger
- Extra Layer for color Change