Why do you not have metal duck heads?Updated 2 years ago

The most important criteria about our duck heads is that they must not cause any damage to the rim and tire. We have made them in plastic to minimize the risks. The downside of this is that they will also wear out faster. However, if the rim is in good condition and does not scratch the inside of the duck head, then each duck head should be useable for hundreds of tire changes at least.