What feature is commonly found in dry sleeves?

The correct answer highlights that dry sleeves often incorporate cooling fins. This feature is essential because it enhances the heat dissipation capabilities of the sleeve, allowing for more effective cooling of the cylinder walls. Cooling fins increase the surface area exposed to the air or, in some designs, to the coolant, which helps maintain optimal engine operating temperatures and prevents overheating.

Dry sleeves are typically designed to fit into a cylinder block and do not come into direct contact with the coolant; they rely on the cooling fins to manage heat. Increased wall thickness can sometimes be a characteristic of different sleeve designs but is not a defining feature of all dry sleeves, and similarly, corrosion resistance may be a factor in material choice but does not directly pertain to the dry sleeve design itself.