Tatra roundels are made the traditional way - by hand. Molten glass is gathered on a pontil rod and is spun between two graphite boards. When the desired diameter is reached, the roundel is broken off the rod and allowed to slowly cool in an oven. The making of roundels is highly skilled, and due to the manual production process, each piece is entirely unique.
Two standard sizes are available - 55mm - 65mm diameter and 80mm diameter.
(sizes are approximate)