These piezo rods are 2 3/4 inches in length, about 3/32" wide and 1/8" in height. They can also be cut to shorter lengths if need be - see our how-to article on cutting rod piezos for more information.
Customer Gary Slavinsky has this to say: "I just received a piezo rod pickup for my old Takamine acoustic/electric. Despite it being the Christmas season, it was delivered a day earlier than promised. I am very happy with the pickup. I feel like I have a brand new guitar. It sounds SOOOOO much better now. This pickup was inexpensive, but the quality is much better than what Takamine used. I never knew how good this guitar could sound. Thank you. I am going to electrify all of my acoustics now that I see how easy the job is."