Metal replacement pads with cooling fins for Shimano disc brakes SAINT BR-M820 and ZEE BR-M640. Metal pads have a longer lifespan compared to plastic pads, are more fade-resistant, and provide consistent braking performance in both dry and wet conditions. However, metal pads may produce noise when braking. Plastic pads are quieter than metal pads but offer lower performance and have a higher wear rate. Includes spring and securing pins.