Square with double curvatureMineral crystals CRT-Bestfit, domed both sides. Products nameVersionmaterialABthicknessitem No.CRTdomedMineral17.0014.90-CRT170149CRTdomedMineral20.5017.50-CRT205175CRTdomedMineral22.0019.00-CRT220190CRTdomedMineral22.5019.00-CRT225190