3/4 inside Diameter. I've used so many different slides in my life. I hated them all. Noisy, scarring up the side of the guitar neck, heavy, too big or small. That's over now, ladies and gentlemen!!! This slide is light as a feather. Very comfortable. GREAT warm tone. None of that clanking, banging noise metal or glass slides make. And they won't break when you drop them! Made of the same wonderful material as the V-Pick Guitar Picks. I am truly impressed and fascinated with this material. There are 8 different cast acrylics available, and I've gone through them all. I chose this one because of it's durability, gliding action, tone and easy grip. I believe this is the best guitar slide on the market. AND, if you get into a bar fight, they make a great knuckle sammich without cutting your hand! Just kidding......Vinni Smith

hi nancy well after 30 yrs playing and teaching i've finally found the right pick..i think the v pick is superb...thank you so much for the free one too it is a pleasure to deal with a company so dedicated to the customer..i've ordered a couple more picks simply because i wont be using anything else from now on..i can now get that muddy waters tone when i play slide..and a warm bluesy sound when playing standard...thank you once again love light and peace brian..