HEX (Piet Hein-1942) could be the perfect abstract board game. It has the simplest rules of almost any known game, yet is remarkably difficult to play well. nestorgames portable 14x14 HEX set contains 196 discs in two colours (red and blue), a cotton case and 2 pads. The discs are 15mm diameter and 5mm thick.
You can also purchase the 11x11 edition here. If you've already purchased the 11x11 edition, you can 'upgrade' it to 14x14 (see upgrade button below). This 'upgrade' contains a cotton case, 2 pads and 76 discs in two colours.
With this set you can also play Dhex, by Néstor Romeral Andrés.
Rules not included. But you can access them by clicking the 'Rules' button below.