... called as carbonless note book, carbonless invoice book, carbonless message book, carbonless order book, etc..Environment-friendly material&Ink ... , Book. Magazines, Leaflet, Poster, Flyer,Booklet, etc..Usage:leave message, telephoe #, order information, invoice, statement, agreement, etc..Carbonless Book ... paper.OEM welcome, size optional, good quality Carbonless Message Book (Post It Note Inside)