Best guess - the T350 appears to replace the T300. Wondering if the previous exposed inserts on T300 irons will be better hidden than the M on the 2021 long irons.

I believe the 350 will replace the T300; the 150 will replace the T100S

I like the looks of the T350 in the limited photos which I have seen.

T100 the same, T150 replace the T100s, T200 same, and the T350 replaces the T300 and T400. From all I have read. All are forged but the T350 is a cavity back. Hope all signed up on this site to get updates from Titleist as they release them. Best to get the information straight from the horses mouth, as we say here in the South, rather than the other end. Forgive the pun.

Chuck...don't count out a T400 release in the U.S. They are for sale in Japan, however, Titleist has not released information on future availability in the U.S.