The Jem Large Rose Set of 4 includes a large; rose petal, rose leaf, rose calyx and a set of thorns to attach to the floral wire. . They are used to make the Rose flower for use in floral bouquets using gumpaste, fondant or chocolate. The cutter sizes are in approximate sizes; The rose petal is 2-1/2" x 2", The rose calyx is 2-7/8" x 2-7/8", the rose leaf is 2-1/2" x 1-1/2" and the 4 thorns are 1/4" x 5/8". The plastic cutters have an easy grip on the back side. This set of cutters also comes with a set of step by step instructions provided by JEM.