GT FLEX’s superior strength, flexibility, and affordability make GT FLEX the easy choice for practices, labs, and retainer and aligner companies worldwide. GT Flex Pro is 10 – 15x stronger and more flexible than GT FLEX ORIGINAL. Available in 5″ Square, 120mm circle, and 125mm circle. We recommend 0.8mm thickness for aligners; 1.0mm for retainers. Order a 10-sheet sample pack to try it out for free!