I personally made these by hand, with no molds. These stitch markers are made from polymer clay, baked for hardness & durability. A one of a kind item, they look similar but no two are alike! The Cactus are approx. 1/2" to 1" tall. This set fits up to a size 10.5 US knitting needle (6.5 mm) or they can be converted to lever back hooks for crochet. They come hooked on a 2 inch kilt pin which can be used as a stitch holder!