Magic YoYo K1 Response Pad - 21mm OD
These response pads are approximately 21mm OD (Outer Diameter), 16mm (Inner Diameter), and approximately 3mm width. I have compared these with the CBC Broad response pads, and the silicon bit is slightly smaller than the broad pads, so I'm not sure if they are suitable to replace them.
However, these are the pads that are used in the Magic K1 yoyo, so they are perfect for that yoyo!
Note that each packet contains TWO (2) response pads.