"Today’s work is to paste protective film on the iPhone’s plastic back cover to prevent it from being scratched on assembly lines. This iPhone model with a plastic cover will soon be released on the market by Apple..."
Source: http://www.phonearena.com/news/Labor-watchdog-report-accidentally-outs-the-budget-iPhone-5C-confirms-plastic-shell_id45844
Source: http://www.phonearena.com/news/Labor-watchdog-report-accidentally-outs-the-budget-iPhone-5C-confirms-plastic-shell_id45844