This kit is for upgrading you MC9400QCP. The included USB drive features a machine upgrade that will add the Ruler Work Function to your machine. You will also receive four brand new feet that will prove very useful and enhance your sewing and quilting. Each foot was devised and developed with the goal of supporting your creative needs. They are: Ruler Work Foot, Variable Zigzag Open Toe Foot, 1/4" Seam Foot without guide, and Darning Foot Open Toe.