The clear single flare retainer is hand blown by Glasswear Studios. The 18g and 14g are made from fused quartz glass, 16g 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.
