This Martyr Anodes CMR02AL Rudder/Trim Tab Anode is a high-quality product for outboard engines and components. Its brand name is Martyr and the manufacturer part number is CMR2. This anode is made of aluminum and has a size of .5 H x 2.81 OD x .28 ID. It is a great choice for those who need a reliable and durable anode for their boat.