Black. Clear lens. With an overall length of 14mm; a metal housing diameter of 10mm (1cm) and lens diameter of just 7.8mm the Spot RB is an ultra small taillight that re-defines miniature. Easy to overlook in traffic; you''d say; but the High Output power LED in combination with the special Extranz Extreme Optical Transparency technology actually gives it a colossal light output; when taking in account its tiny dimensions. High quality and ECE compliant so fully street legal. This is The One for those that like a taillight not just small but virtually invisible on a bike; until activated. With M5 x 6.5mm threads.- ECE-approved for rear use - EXtranz® - Extreme Optical Transparency Technology - Kellermann HighPower LED Technology - Longlife Protection Guard®; IC operated; 330 kHz- High quality metal housing - Suitable for 12 volt DC applications - M5x0.5x6.5 threaded - Dimensions: Length 14mm; max. diameter 10mm; lens diameter 7;8mm - European design protection Note: See turn signal section for style & size matching Spot turn signals and position lights.