Here`s 3 of my custom guitar slides that i make. Their called my " half n half " slides. Bottom is real cow bone with a wood top half. You get two different sounds … the bone produces a brite sound while the wood is more soft. The top 2 have Spectraply tops [ i posted this photo on my facebook page and my customers went nuts…lol ] and the one in front has a Cocobolo top. These are the first 3 of a 30 count batch that i`m working on now.