A "Glass Coaster" made by spinning technique.
You can place any glass on the coaster, and the color of the material will penetrate the glass with the reflection of the light, bringing joyful expression to your drinks.
These coasters can be stacked together to save space (see 6th slide above).
You may also use the coasters as a tray for jewelries or items like keys, clips, etc. (see 7th & 8th slide).