This commercial ink roller is designed for older Key-Mat mechanical bag coders. The rollers are sold two at a time (Pair) so you will be getting two rollers. The dimensions of this roller is: 1/2 inch shaft diameter, 2 ½ roller diameter, 3 ½ roller width. Our standard ink rollers are displayed online for each purchase. You can choose from various colors including: Dry (No Color, Black, Red, Green, Yellow, White and Blue.