You are purchasing a case of 10 tubes of Wholesale Widgets brand black compatible ink.  Compatible with the Riso S-4254 Ink.

For use in Risograph EZ220, EZ390, EZ391, EZ590, EZ591, MZ390, MZ790, RZ220, RZ230, RZ310, RZ390, RZ590, and RZ790 digital duplicators.

This product has been recently manufactured and has a long shelf life.  We have had great results with this compatible brand.

Please feel free to email me any questions about compatibility, etc.    We pack the product boxes in another box to protect them during shipping. Thanks for looking at our listing.