Is it glass or acrylic?
Er, dunno. Glass probably. How do I tell? It's got the mini Omega symbol in the middle, if that's any indication?
Touch it against your top lip. Does it feel cold? If so, sapphire glass. If not, hesalite acrylic.
EDIT: it looks like sapphire crystal to me, given lack of distortion.
EDIT EDIT: I just read that the sapphire crystals don't have the Omega logo though. Not sure if that is true.
@Diamond_Supercool started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
Is it glass or acrylic?