Black plastic castanets with a strap. Fibra Vetada Doble, size 5 (9cm x 7cm) - Color: Black - Material: Synthetic resin - Brand: DEL SUR - Accessories: Strap Thank you for viewing. I purchased these about 3 years ago from Iberia Shop. I only used them for a few months because I bought different castanets. I think the sound is more muffled than usual. I don't remember exactly, but I think they cost around 35,000 yen.