Thanks for the feedback guys.
I've considered metal but it would increase the cost.
The plastic upside is that you won't scratch the fuel tank should you bump it with the tool.
Velcro has been suggested as has a hole for a lanyard.
The hole is easy, the velcro would be as well but also will add to the cost.
BTW, I can also make these in black but it's easy to forget it on the nozzle because it blends in really well. But if there is enough demand for black I'll run a batch, just let me know.