Comparison : Item # KSP3LX, KSP, KSP-A Series Control Ball Bearings
Item # KSP4AX, KSP, KSP-A Series Control Ball Bearings
Item # KSP5AX, KSP, KSP-A Series Control Ball Bearings
Item # KSP6AX, KSP, KSP-A Series Control Ball Bearings
Item # KSP 3X, KSP, KSP-A Series Control Ball Bearings