Check the listing for details. REPLACEMENT PARTS - Alesis Command X Mesh-Head Electronic Drum Set. Condition: Used. Listed at 19.99 USD. All items have been tested and are in working condition. Please check if these drums are compatible with your set before placing order! No refunds for incompatibility! Reference to Clamp size below: Inner diameter for the Larger hole on the clamp which is intended to go around the frame is 36mm or roughly 1.4" inchesInner Diameter on the smaller hole that is used to hold the accessory or rods that hold the drum is 19mm or roughly 3/4" of an inch Please keep in mind, this listing is for replacement parts, I have tested this drum set thoroughly and it is in good working condition, it is used, but as you can see from the pictures, not terribly abused. Only flaw worth mentioning is the Control Module did have some fading, and some stickiness to the rear of the unit, but I did wipe it off as best as possible, price reflects condition! Besides that it is in good working condition, choose whichever parts you need from the drop down menu for purchase, if you see something in the pictures, but not listed, and wondering if I have it in stock, give me a message! :)