Product availability as of 22-Nov-09 Name Size Color Availability Air Vent Reduction Dryblocs 5 x 7.25 x 20 in. Assorted Ships within 24 hours. Air Vent Reduction Dryblocs 4.5 x 7 x 17 in. Assorted Ships within 24 hours. Air Vent Reduction Dryblocs 5.25 x 7.75 x 21 in. Assorted Ships within 24 hours. Air Vent Reduction Dryblocs 6 x 8.75 x 22.5 in. Assorted Ships within 24 hours. Air Vent Reduction Dryblocs 7 x 10 x 25 in. Assorted Ships within 24 hours. Go back to the Air Vent Reduction Dryblocs