Contains: 1-Endo Ring, 1-Endo Arm, 2 XCP-DS Fit Endo Biteblocks The XCP-DS FIT Universal Sensor Holders Stretch to FIT Any Size - Any Brand! Self-adjusting clip stretches to fit size 0-2. #1 Selling Autoclavable Sensor Holder in the USA.* One Holder FITS Size #1 and #2 Digital Sensors. Fast and easy to load. Color-coded for fast assembly. Less Flexing - Rigid sensor support keeps sensor positioned accurately. Silicone-cushioned edges help provide patient comfort. Use with relaxed-fit sensor cover.