Totally spot on with the Alibaba tires.
I’m at about 4k miles on these:
The harder ones usually are marked “NYLON” and initially look like cheap hard plastic until they’re broken in. These aren’t quite as soft as the true rubber ones but they last forever, and I ride through broken glass without pause. I have a set of each material type, same mold. The softer ones are at the same level of wear about 1k miles in.
@Shikaka I rock those exact tires when I want super grippy soft street slicks. They’re great and a lot of fun to carve hard on.