-This extraordinary expansion appliance has the ability to do the following: Rotate, upright, distalize, expand the anterior as well as the posterior arches with gentle biocompatible force. -Slower expansion, resulting in less chance of relapse. -Thermally-activated Nitanium for total control. -Easy to apply and remove by the doctor. Arms and loops allow adjustability for fine-tuning and finishing. -40 mm. **For further product information, please contact Chat Support**