Other materials besides rubber may be used to produce a stamp. Woodcut and linocut, the carving of linoleum, are art forms based on the same principles. Linoleum is much harder than rubber and thus requires special tools. Woodcut is mostly used by professional artists, requiring much talent and patience. Rubber carving material can be purchased, but is marketed as a child's toy and not widely used. Additionally, photopolymer stamps are growing in popularity. They are most often produced in a set of coordinated images using a clear polymer material on an acetate carrier sheet for storage and packaging. The stamps are peeled from the carrier sheet and applied to a clear acrylic handle. This allows the stamper to view the image through the handle and effect precise placement of the image where desired. Photopolymer stamps are generally produced in the United States for sale domestically and internationally. Similar clear stamps made of silicone are produced by U.S. companies in China. Silicone stamps have many of the same properties of the photopolymer stamps. The production of clear stamps makes storage of a large collection of images easier, since they are all used with just one set of various sized handles. They are also often very economical being produced in sets of several images which work together to form a cohesive look.
There are several possibilities to vary the look of car