Replacement Pad for Mastercool MCP44 Dial 3420 Rigid Media Set Replacement Pad for MasterCool Evaporative Window Cooler Models -MCP44- MCP44E- WPL44 and WPL44NP There are 4 pieces in this set. 2 Pieces for back are 2" deep x 35-1/4" tall x 12" wide. 2 Pieces for each side are 2" deep x 35-1/4" tall x 6" wide. Long Lasting and Durable, Easy Install, High Efficiency Comes with the plastic retaining pins and washers.