Type is Hertner Nagel 39. Gauging: 0.57-0.6mm (Measured the center thickness with calipers.) 0.57mm → 3 pieces 0.58mm → 6 pieces 0.59mm → 12 pieces 0.6mm → 4 pieces Brand is unknown. Thickness is written in pencil. My husband bought these on Mercari, but they didn't fit, so I'm selling them.