Kera-42 cream, 42% Urea+ Tea Tree + Aloe +Antioxidants ,"Professional" Callus Care. KERA-42 CREAM is a urea-based daily moisturizer that supports the appearance of healthy skin. KERA-42 CREAM also contains tea tree oil, aloe vera, and antioxidants that provide additional hydration to damaged, rough, and dry skin. Product and Attributes: Smooth and silky Large tube size – 6 oz. (170 g) Easily absorbs into the skin Clean scent Paraben-free Available in a 6.0 oz (170 g) tube.