You can either purchase one bottle, or an entire set of 12 colors. If you choose a pack of more than one color, put your color preference in the notes to seller section <3These are pigment dyes for UV and AB epoxy resins. You can buy individual colors or you can get the whole set of 18 colors.Colors and stock of colors fluctuate constantly.Each bottle is approx. 10gBottles Ship half full to try to prevent leakage during transportation.You may get bottles with different lid styles on them.To add color to your resin use a drop of colorant to your resin. Add more drops as needed to achieve desired color. You can mix colors as well.Please use the same safety precautions as you would with your resin. Please use in a well ventilated room with gloves.