Jale Fibra. This is a current product. It's sold on sites like Rakuten for 16,000 to 23,000 yen. With its rounded shape, and the way the two shells of the castanets come together to form a thin edge, I personally find it very easy to play. It's very similar to a "Tarrega," with some differences in shape. Actual measurements: 8 cm from the indented part to the bottom, and 6.6 cm at the widest point horizontally. It's a bit small. The website listed it as size S. (The website's size measurement is not from the indented part. The overall length is about 8.7-8.8 cm) There is a Jale stamp on the inside. Weight: 158.5g for the pair. Since it's an older item, the box is quite damaged, but the castanets are unused. Due to the box's condition, I've listed it as "near new." The box will be folded and shipped. Please refrain from price negotiations.