The jelly roll or Swiss roll design is the design used in the majority of cylindrical rechargeable batteries. In this design, an anode material is laid down, a separator is applied, and a cathode material is laid down. This is then rolled up and inserted into a hollow cylinder. The battery is then sealed and an optional button top is applied if the battery is intended to replace a AAA/AA/C/D alkaline battery. A label with the brand name is then applied (or a blank protective label, often green (NiMh) or blue (NiCd), for a generic or OEM battery). The design gets its name because the cross section of the battery looks like a Swiss roll. Occasionally the design is used for primary (non-rechargeable) batteries, although most primary batteries use the conventional rod-paste-tube design.