Clave Block SetMade from high quality composite material, sounds fresh, natural and clean! Very nice sounding block!! Easily attaches to most percussion stands.Mounting opening is about 3/8" or 1 cm diameter. So you can mount it on any stand or a rod of this (or smaller size). TONE SPECS - 1 is the lowest tone, 6 is the highest tone:- PURPLE block is around 2.5" in length. Tone is 6 out of 6.- YELLOW block is around 3.25" in length. Tone 5 out of 6.- RED block is approx 3" inches wide. Tone is 4 out of 6.- GREEN block is approx 3.5" inches wide. Tone is 3 out of 6.- BLUE block is approx 5" inches wide. Tone is 2 out of 6.- ORANGE block is Just over 6" inches wide. Tone is 1 out of 6.