The Alpha Pad is for MrSpeakers Mad Dog with Dog Pad owners considering an upgrade to Alpha Pads (3-5 minutes, no tools), owners of Mad Dogs with Alpha Pads needing new pads, and owners of Fostex T50RP "modded" headphones looking for a nice leather pad. If you have Mad Dogs with 840 pads, you should purchase a tune-up and the pads, then mail your phones to us for adjustment. Alpha Pads may be used with other headphones, but we do not warranty fit or performance. Dimensions*: 4.25" long x 3.75" wide Rear 1.5" tall, front 0.75" tall Ear hole 2.5" tall x 1.75" wide, 1.6" deep at back of ear NOTE: Alpha Pads are NOT eligible for the 15-day return, all sales are final. *Dimensions are approximate, as product is made of leather, and the dimensions change on and off of headphones can and will vary. As such there is no warranty on dimensions, these are here as a convenience for customers only.