Hole liners | Golf Monthly

I thought it was 1/4" but I've no idea where I got that from so most likely wrong.

We had them last year and although I knew it wasn't right I said nothing because I liked them.

They keep the hole edges clean like they've just been cut, and weirdly make the hole look bigger than if the edges have started to roll over through traffic.

The downside is that the ball seems to lip out more, and when it does looks like it picks up speed coming out.