Rough surfaces can be seen as consisting of large numbers asperities. Fretting refers to wear and sometimes corrosion damage at the asperities of contact surfaces. The heights of asperities have a random distribution. Her album "Asperities" was released on Leaf on 30 October 2015. Micropits are originated from the local contact of asperities produced by improper lubrication. Skin is smooth or may have very small asperities. This actual area of contact, caused by asperities increases with pressure. They are rough, with sharp, rough or rugged projections, termed "asperities". As known, the contact between two surfaces occurs through the interaction between asperities. This provides interlocking surface asperities and increases surface area for bonding. However, these tips usually contain many asperities. Most parts of the body are covered by tiny asperities. Most fault surfaces do have such asperities, which leads to a form of stick-slip behavior. Their motto was "Per acuta belli" ("Through the asperities of war"). However, not all asperities will have had material removed when sliding distance 2"a".