It helps with hand positions at address to either add loft or deloft the club for various types of shots.

Did not know, thanks! =)

Here’s something to read up on flight line and it’s origin.

golf.com/.../

I saw these on an SM9 on Sunday as a Titleist rep was playing my golf course. It is a pretty useful alignment.

Just got my 2 new SM9 Black wedges with white flight lines on the hosel and played with them for the first time today. I got 54/14 F grind and 58/10 S grind. I think the flight lines are really helpful, used them for the first time today and shot 79 with a couple of good pitch and bunker shots using this tech from around the greens. Would recommend them highly, they are not really noticeable unless you are looking for them. They make opening the face and shaft lean a lot more consistent than just going by feel/visuals. Hope this helps someone struggling with short game like me!

I ordered 3 wedges last week and can’t wait to get them. Ordered the flight lines on the 58 degree only because the 54 and 48 I tend to use a square face and only open up my 58/60. Think they are a great idea.

I wish you could send your vokey's in and have them added to older wedges similar to how you can have custom work done to SC putters!!

Wedges wear out... wouldn't make sense, when most people replace wedges every year or so.