For your RV shade with a 1" diameter and 24" spring length that slow closes, the correct replacement spring is the Irvine 1" Valu-Line large size spring designed for shades 30" and wider. The premium slow-rise springs fit 1.25" diameter tubes, so unless your shade tube measures 1.25", you should use the 1" diameter Value Line spring. The black inside and white outside color does not affect spring compatibility. Always measure the tube diameter first to ensure proper fit.