Riso Z-Type S-4253 MZ Black Ink - Box 2,1pcs S-4253 RZ ink Z INK is suitable for RISO RZ RV Z - AliExpress,Amazon.com: RISO Risograph S-4254 Black Ink (2 Ctgs/Ctn) : Everything Else,Premium riso ink z type for the Highest Quality Printing - Alibaba.com,Amazon.com: RISO Risograph S-4254 Black Ink (2 Ctgs/Ctn) : Everything Else