What's that blue rack for Pro-Stitcher called? Pro-Stitcher Flexirack

The Pro-Stitcher's secret to smooth left-to-right motion (the X axis) is the blue Flexirack. It's pretty tough, but if damaged, the best solution is to replace it.  Or if you're moving from a 10-foot frame to a 12-foot frame, you'll need new Flexirack. It's sold in 12-foot lengths. Cut to size. You'll only need one.