The mini-starter kits include one 22cm length of material of your choice of sizes plus the special scissors for cutting the Ribbond. There is an up-charge of one length. One length is 75% the price of three pieces. Ribbond widths usages: 2mm: Periodontal splints. Bridges. Orthodontic retainers. Composite restorations. Trauma stabilization. 2mm & 3mm: Periodontal splints. Bridges. Composite restorations. 3mm & 4mm: Bridges. Composite restorations. Acrylic applications. -- 1mm (Ribbond-Orthodontic) : Only for post-orthodontic retainers with ½ mobility or less. Please call 800-624-4554 to order Orthodontic size. -- Ribbond starter kits and refills do not include the Ribbond Wetting Resin or the Ribbond Securing Composite. Those materials are sold separately. The Ribbond-Ultra was introduces in 2013 and is 0.12mm thick. The Ribbond-THM was introduced in 2000 and is 0.18mm thick. Counter intuitively, the Ultra is slightly more fracture tough that the THM. Most dentists prefer the Ribbond-Ultra.