A round catheter of 1 French has an external diameter of 1â3 mm, and therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3: D (mm) = Fr / 3. or. Fr = D (mm) * 3. For example, if the French size is 9, the diameter is 3 mm. round catheter of 1 French has an external diameter of 1â3 mm, and therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3: D (mm) = Fr / 3. or. Fr = D (mm) * 3. For example, if the French size is 9, the diameter is 3 mm.
In the FAQ on the PRS site it says: We set-up the guitars at our factory with the following string gauges: Most solidbody instruments are factory set-up with 10 - 46 gauge strings. The DGT is factory set up with 11 - 49 gauge strings with unwound 3rd.
In most cases their strings are not interchangeable. Using steel strings on a guitar built for use with nylon strings can seriously damage it. The neck construction and top bracing of classical and flamenco guitars are not designed to handle the far greater tension produced by steel strings.