Created to be nearly the same size as the rubber spring mute that comes standard on the Ibanez AZ series. *Please note that these are handmade, so there may be variations in size. The third photo is an image of the original part that comes with the AZ. It has the effect of suppressing the resonance/vibration of the springs. Soft-type springs like Raw Vintage can sometimes produce too much reverb, but using this will moderately suppress the sound. This is a set of 5, so you can adjust the sound by changing the number of springs you use. The original part is made of rubber, but it is made of silicone considering aging and deterioration. Multiple sets can also be purchased. If you comment with the number you need, I will create a dedicated listing. Ships via mini-letter. 2TRX5BA010 2TRX5BA011