4 Bridgestone Blizzak WS80 Studless snow tires size 215/50 R17

I have 4 Bridgestone Blizzak WS80 Studless snow tires size 215/50 R17. No leaks, no patches. Used a couple of winters. Brand new these tires come with a tread depth of 12/32. These tires are currently at 9/32.