If you ever look at the surface of a carbon steel bearing with a magnifying glass, you'll see that it looks like it has moon craters on the surface. They aren't visible to the naked eye but they're there, even when polished to a mirror shine.
Stainless steel is much less porous than carbon steel bearings so they are kinder to the playfield and seem much faster with a mirror finish. They may also be a little cheaper in the long run too. I've never seen them pit out like carbon steel bearings so I have been able to reuse them over and over again after running them through a buffer.
The only problem with stainless steel bearings is that they're not very magnetic so they don't work well on games that use magnets to hold or move the ball.
http://www.gmsball.co.uk
search for stainless steel, select unit, milimetres >26mm 27mm is the size.
Stainless steel is much less porous than carbon steel bearings so they are kinder to the playfield and seem much faster with a mirror finish. They may also be a little cheaper in the long run too. I've never seen them pit out like carbon steel bearings so I have been able to reuse them over and over again after running them through a buffer.
The only problem with stainless steel bearings is that they're not very magnetic so they don't work well on games that use magnets to hold or move the ball.
http://www.gmsball.co.uk
search for stainless steel, select unit, milimetres >26mm 27mm is the size.