These are separate stamps and require an acrylic block in order to use. The stamp peals off the backing it comes on and is placed on a clear acrylic block to stamp. It is best to clean the stamp immediately after use with special stamp cleaner or warm soapy water and then place them back on the sheet for future use. Take care of them and they will last for a very long time. If not cleaned right away, they will stain and possibly ruin the project the next time you use them. Also, when stamping, use a mat and do not rock the stamp back and forth for the best result. Stamp with one color at a time only and clean prior to using another color ink.