Kit includes: 1 Ring - Bitewing (red) 1 Arm - Bitewing (red pins) 4 Biteblocks: Size # 2 horizontal XCP Extension Cone Paralleling is Your Key to Accurate Positioning: Quickly align the x-ray tube to media and prevent cone cutting using this XCP Extension Cone Paralleling kit. Provides accurate positioning with the color-coded components for precise x-rays. Works with Film and PSP imaging plates. Quickly align the x-ray tube to media. Accurate positioning and precise x-rays prevent cone cutting. Easy to assemble with color coded XCP components. Patented color coding: Anterior-Blue Posterior-Yellow Red-Bitewing. Autoclavable for low cost per use. Kits include a combination of Arms, Rings and Biteblocks.