Yale Patented cylinder key
Average Price: £7
Top Price: £10
These patented keys have been on the market since 2018. They are more expensive to buy wholesale than regular, non patented keys.
If you are unsure if yours is patented, take a close look at each side of your key. It will say patented in small writing around or under the head. Most key cutters will still be able to cut these but they will cost more.