The clear tongue retainer is hand blown by Glasswear Studios. The 14g are made from fused quartz glass, and 12g are made from borosilicate glass. Three clear silicone o-rings are included. Gauge tolerance is +-0.1 millimeter. Please note these are glass and can break if forced to bend. Not recommended for athletic or violent activities. Choose your size below.
Note: These will measure a couple millimeters longer than the advertised wearable length in order to allow room for the o-ring. We recommend cutting the heat sealed bag with scissors and not tearing it open. The plastic stretches easily and may put stress on smaller glass items.