Ashland(TM) Box Film Ball Cube II EBT3, P/N: 027863-002 rev E Product is used to calibrate CyberKnife systems
the Ball Cube II phantom calibration film was not manufactured within necessary dimensions and may introduce up to 0.5 mm of positional inaccuracy to the CyberKnife System
Worldwide Distribution: United States (nationwide), and countries of: United Kingdom, Germany, France, Finland, Netherlands, Portugal, Hong Kong, Poland, Australia, United Arab Emirates, Thailand, and Japan.
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-3211-2018