The tuning fork is made of metal, making it a high-quality and accurate tuning fork for the beginner guitar or violin player, for the musician or teacher, or for the science enthusiast. The tuning fork device on the A440 sounds accurate, producing a clear and long sound, perfect for tuning guitars, ukuleles, violins, and pianos and keeping them in tune. The 440hz tuning fork is about 12cm long and is of a moderate length, making it easy to put into schoolbags and pockets. The therapeutic tuning fork is made of and material with a smooth for a comfortable grip. Colour:Silver Material:Metal Package Contents: 3 x Tuning fork 1 x Silicone hammer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.