There is a 360 - degree rotating stainless steel ball present for adjusting the angle of the holder and blue indicator lights for showing the charging status. (indabaa.com)
The researchers released small steel balls down the mucus - coated slide, which was mounted at an angle. (thescienceexplorer.com)
- inch steel balls and 1/2 - inch glass shots. (geekwrapped.com)