Rubber Base + Builder Gel + E-File package Course - In Person Training Forrest Hill, Auckland1 Day This course is made up of Rubber Base & Builder Gel day Course and E File day Course. Meet our number one Top sellers Rubber Base & Builder Gel. It provides a flexible, yet strong gel in a range of naturals, white and clear shades. Rubber Base & Builder Gel is designed for naturally weak nails to help strengthen and grow the nails. When applied to perfection you will get no lifting or chipping, it's self levelling which makes application