Peter Thomas Roth Firm Peeling Gel 200 ML. PETER THOMAS ROTH Super-Size FIRMx Peeling Gel Exfoliant 200ml / 6.8 fl oz. This super-sized peeling gel is brand new with seal unboxed. What is it: FIRMx Peeling Gel is a unique exfoliator that prepares the skin for optimal absorption of skin care products while antiaging ingredients help firm, brighten, and hydrate the skin. Who is it for: FIRMx Peeling Gel is for anyone who wants their skin to appear firmer, more radiant, moisturized, and exfoliated in order to allow for optimal absorption of antiaging skin care products. FIRMx Peeling Gel is for all skin types.