Becausr cheese is made from cow juice, duh

Two kinds of cheese marbled together, which are different colors: colby is orange and monterrey jack is white. For reasons probably obscured by history, they are frequently combined.

"Per capita consumption of American-style natural cheeses such as cheddar, Colby and Jack cheeses rose from 11.7 pounds in 1995 to more than 15 pounds in 2017"

In this case cut into "cheese stick" and sold that way for convenient snacking.