"Side run," also known as side trim or side cut, represents the surplus or residual paper generated during the paper manufacturing process at mills. It comprises the paper that remains once the primary paper roll has been trimmed to the desired dimensions.

This surplus paper often exhibits a variety of sizes and specifications that might not align with the mill's standard product offerings. Despite its non-standard nature, side run can still be of exceptional quality and fully functional, making it a valuable resource in various applications.

A "paper ready stock " is a batch of paper grouped together based on shared characteristics like type, size, weight, color, or production date. It's used for inventory management or sale, often in the paper industry, to efficiently categorize and trade paper supplies.

Paper ready stock can vary widely, ranging from large quantities of a specific paper grade used in commercial printing to smaller lots of specialty papers used in various industries.