Bearing shielded or sealed

[carcan]

On VXB bearings site there are two kind of VGroove bearing:
http://www.vxb.com/page/bearings/PROD/V-Groove-Bearings/Kit8352
and
http://www.vxb.com/page/bearings/PROD/V-Groove-Bearings/Kit8406
both have the same price, the only difference is in shield.

What kind of shield is better for MM ?

Thanks

[smreish]

Sealed......you don't want dust and debris getting in the rollers.

It's your second link in the post.

[carcan]

Thanks!!