Etch Gel Refill 4/pack. 9.5% Hydrofluoric Acid Etch Gel for use on porcelain veneers and inlays prior to cementation or repairs. Refill includes 4 - 1.2 ml syringes, 25 - 25ga Micro Flowthru brush tips. * NOT returnable due to safety concerns resulting from a temperature control fluctuations. 4 - 1.2 ml syringes & tips