I recently purchased this and it arrived, but I accidentally bought the wrong size, so I am selling it as a new, unused item after opening the package. Only tried on, never used. Left-handed, 23cm Corrective chopsticks to learn the ideal way to hold chopsticks. Due to the special structure with indentations that follow the shape of the fingers, these functional corrective chopsticks allow you to naturally and effortlessly learn "the ideal and correct way to hold chopsticks, suitable for dining etiquette." It's easy to use! You'll understand once you hold them! [Product Type List] (Type Number: Type Name) Type 1: -/ Left 23cm (11436-3) Type 2: -/ Left 20.5cm (11438-7) Type 3: -/ Left 18cm (11452-3) Type 4: -/ Left 16.5cm (11439-4)