Bosphorus have stamped them as "Bright". You can find examples of Bosphorus 14" Traditional Hi- Hats on YouTube. These are very versatile hats, 100% handmade in Turkey, crafted from a premium B20 bronze alloy.
Bosphorus Gold 14" Hi Hat Cymbals
Istanbul Mehmet Traditional 14" Hi Hat Trio
Bosphorus Master Vintage Hi Hats 14" Excellent Condition (832-1036g)
Bosphorus Turk Series 14" Hi Hat Cymbals
Bosphorus Cymbals 14" Painite Hi-Hat Paper Thin
Bosphorus Turk Series Hi-Hat Cymbals Pair 14 in Diameter 2-Piece Set