Smd Component Assorted Folder R0603 1% 170 value x 50 Piece Chip Resistor Booklet 1% 0603 SMD Resistor assorted folder 170 value x 50Pcs chip Resistor Booklet, electronic Component Surface mount 0603 Resistor and capacitor sample book Resistors: 0603 serial Resistor. 170 value 50Pcs each value When components are used up, the book itself could still be reused for your other components. This kit is specially designed to keep surface mount components. It looks like a book, so we call it a sample book.