In an example, an apparatus includes an electrically conductive component having a first side and a second side, a first switching material formed on the first side of the electrically conductive component, and a second switching material formed on the second side of the electrically conductive component. The second switching material may include a different material than the first switching material and resistance states of each of the first switching material and the second switching material are to be modified through application of electric fields through the first switching material and the second switching material. The apparatus may also include an electrode in contact with one of the first switching material and the second switching material.