Screwed wooden frames manufactured from beech in 8mm heights, with inner and outer parts polished after grinding. Height: 8mm Diameter: No. 1 - 100mm No. 2 - 130mm No. 3 - 160mm No. 4 - 190mm No. 5 - 220mm No. 6 - 250mm No. 7 - 280mm No. 8 - 310mm