"It is a great design. I was hoping for it to be thinner, but since the design includes the key, that isn't going to happen.
I think a good extra design would be to make it without the physical key inside. You could then reduce the size further, which is desirable. If you do create that design, please let me know. I will purchase that one too."
Hyundai Key Fob Replacement Shell 3D Model – Compact Design - Compatible with Hyundai and Ioniq car fobs! (Digital Download)