Check the listing for details. Redken Pro-oxide Cream Developer - 10, 20, 30, 40 Vol - Pick Volume. Condition: New without box. Listed at 22.60 USD. ALL LITER SIZED. WHAT IT ISPro-oxide Cream Developer is the dedicated developer for Redken's haircolor lines: • Color Fusion• Color Gels Lacquers• SEQ Cover Plus• SEQ Cream• Freehand Lightener• Blonde Dimensions• Flash Lift• Up to 7• Blonde Idol High Lift It mixes haircolor to an ideal consistency for controlled and precise applications. It is available in 10(3%), 20(6%), 30(9%) and 40(12%) volume.WHAT IT DOES• Color Fusion mixes in a 1:1 ration with 10, 20, 30 or 40 vol.• Pro-oxide Cream Developer for up to 4 levels of lift.• Process at room temperature for 35-45 minutes.WHAT ELSE YOU NEED TO KNOWNo other developer may be substituted for Pro-oxide Cream Developer. To do so would cause unpredictable results.