The Color Card has 24 removable tips to show your color selection of acrylics, (brush on) gel, nail artpaint and/or nail polish. It is very easy to work with. The tips are transparent which makes it verysuitable for transparent, light and glitter colors. But it can certainly be used for opaque colors too. Whencolors are out of assortment just remove the tips by pulling them out of the Color Card.