Surely you want to save some money on your Aurora essentials. Buy both the base coat and the top coat together in one easy package! You'll get one 15ml bottle of each. The base coat is a "sticky-style" base that promotes better nail polish adhesion to the nail. The glossy top coat is a hardened and protective clear coat that adds extra sheen and shine. Pair them with your favorite nail polish and/or nail wraps for incredible results.