This from a Kawai RX1. These parts are made from ABS plastic. They are the cheaper alternative parts to those made from carbon fiber used in new Mason & Hamlin pianos and Wessel, Nickel, and Gross actions. They are very durable and will not be effected by humidity, but they are a bit heavy. If you have played a Kawai, you may have noticed a heaviness to the action if it has these kinds of parts.