This is certainly a perfect little STARTER SET, consisting of Eight (8) Stainless Steel Rods safely encased within a velveteen lined, leatherette case. Each gently curved dilator measures about 8" long and is double-ended. Sizes included in this set are 3-4mm, 5-6mm, 7-8mm, 8-10mm, 11-12mm, 13-14mm, 15-16mm and 17-18mm