The number of wires in a hydraulic hose refers to the number of wire braids that are used in the construction of the hose. These wire braids provide the strength and reinforcement for the hose.

A 2-wire hydraulic hose has two wire braids, and is typically used for medium pressure hydraulic systems.

A 4-wire hydraulic hose has four wire braids, and is used for high pressure hydraulic systems. It is generally more flexible and durable than a 2-wire hose, and is able to withstand higher pressures.

A 6-wire hydraulic hose has six wire braids, and is used for extremely high pressure hydraulic systems. It is even more flexible and durable than a 4-wire hose, and is able to withstand very high pressures.

In general, the more wire braids a hydraulic hose has, the stronger and more flexible it will be, but it will also be more expensive. The number of wire braids required for a particular application will depend on the pressure and type of fluid being transported through the hose.