Posterior Sensor Holder Tab, Yellow, 100/Pk. Intraoral Sensor holder tabs are for use with XIOS PLUS Intraoral Sensor System. Use for Xios XG sensors. Assists with intraoral imaging. Color-coded design that facilitates use. Durable composition allows reliable positioning. Use the color-coded Bite Blocks with the Xios XG sensor holder. They are disposable, with no sharp edges to ensure optimum patient comfort.The Xios XG sensor is an intraoral imaging device that produces high-quality x-ray images. Use yellow bite blocks for posterior exams.