Igus® DryLin RJ4JP-01-08 linear bearings (made from Iglider® plastic) 
This listing is for a set of six bearings.
Please check diagram in 2nd photo for dimensions.
Please see my other listings for larger amounts at discount prices.

Lubricant free, accurate, easy and quick to install. These are clearly and briefly the advantages of the new solid plastic bearing made from iglidur®. 
The Igus bearings have shown to be a significant improvement over ball bearing type linear bearings.

Advantages are:
Lubricant free alternative to ball bearings
Long service life
Quickly installed, can be secured by circlips if necessary
Light and clean
Excellent noise reduction

No additional postage costs for extra lots up to a total of 100grams (approximately 30 bearings.).
IGUS DryLin® RJ4JP-01-08

Please double check the bearing specifications to make sure they will suit your needs before buying.