We have moved to a syringe and empty tray. This will give you more quality control and also more control to add more gel if someone has large teeth and less if they have small. We will be updating our training videos, pro kit boxes and instructions soon. In the meantime, please see the Digital Download that you will receive via email and after purchase for instructions on how to use. Our feedback so far has been VERY positive. The Professional In-Studio kit includes one whitening tray, syringe (containing our patented SunnaSmile Gel solution), two teeth cleaning wipes, two vitamin E swabs, and one adhesive bib. The SunnaSmile gel works with our blue and red LED light technology to both remove stains while healing abrasions in the mouth making the client have a comfortable and effective whitening session.