When you need a strong, durable wood block the Pearl Clave Blocks come to the rescue. They come in three different pitches: Low (Orange), Medium (Yellow), and High (Green). Pearl's clave blocks are injection molded so they're virtually indestructible, and the the solid color will never chip, fade or peel. The exclusive CDV (Chamber Density Variation) Technology process allows all three clave blocks to be the same dimensions, but still differ in pitch. The blocks have a bracket installed for mounting.