FitStrip IPR Kit. Whether you're looking for safe and accurate IPR for you aligner cases, interproximal cement clean-up, or smoothing out cervical margins, FitStrip is a fast and convenient solution. FitStrip makes your finishing and contouring procedure easier! One handy handle! FitStrips' unique attachable handle has been IMPROVED! It's even easier to attach (or remove) and makes a world of difference for both clinician ease-of-use and patient comfort. Your hand stays outside the mouth, providing a clear field of view and easier operation.