My Freedom Smokes sells the finest Koh Gen Do Organic Cotton from Japan.  Each pad is 3.25 inches by 2.25 inches. Each pad can be halved in depth, giving you two pads of the same 3.25 x 2.25 inches, which is then the perfect depth to cut with the grain for wicking.  Organic cotton is highly absorbent and is not chemically treated, bleached or pigmented.

6 pack of 3.25" x 2.25" pads.