4228 Ernie Ball Borosilicate Glass Electric Guitar Slide – Medium 58mm Long 28mm Diameter   Ernie Ball’s glass slides are made from borosilicate glass for a durable, smooth gliding surface providing a clear, smooth tonal voice. Available in three sizes for your preference and playing style. 58mm long, 28mm outside diameter, 4mm thick   About This Item · Seamless Pyrex glass · Silky bluesy slide sounds · 4mm thick · 25mm outside diameter · 58mm long   FAST & FREE SHIPPING!