OnePlus will let you pick up two cases in one bundle. The Dual Protection Bundle includes a protective case and a silicone case or flip cover case. Karbon and Sandstone are your choices for the protective case while the silicone case is red and the flip cover case is black.
Like switching up the appearance of your phone? This bundle is calling your name. The Karbon and Sandstone cases are durable, and the silicone and flip cover cases are about looks. So you have two cases for different scenarios.