Printhead for epson r390

What is the difference between epson r390 printhead and epson r390 print heads?

There are several distinct differences between epson R390 printers and the epson R390 printers. While epson print heads are equipped with a wide range of print head, and the main difference between epson and R390 printers are in the range of epson print head colors, but the manufacturers offer a huge difference between epson R390 print head and R390 print head.

Since epson printheads are more durable, and they are more expensive to use in printers.