3M™ Process Colour Series 880I is a set of high quality, durable, and transparent inks (except for black, which is opaque) for screen processing of messaging or background on signs made with 3M™ Diamond Grade™, High Intensity Prismatic, Advanced Flexible Engineer Grade, and Engineer Grade Prismatic Reflective Sheeting.3M Process Colour Series 880I can be screen processed on both applied and unapplied 3M Engineer Grade Prismatic Reflective Sheeting Series 3430, 3M High Intensity Prismatic Reflective Sheeting Series 3930, 3M Diamond Grade VIP Reflective Sheeting Series 3990 and 3M Diamond Grade DG3 Reflective Sheeting Series 4000. Application to other grades or types of sheetings or surfaces is not recommended.