• Number of leaves: 4
• 1-3/4" wide
• 25-1/4" long (from center to center of the eyes)
• 9/16" Eye diameter
• Nylon bushing
• 1750lb capacity per spring
• Axle capacity: 3,500lbs

4 leaf double-eye spring.  The PR4B is the most common spring for a 3.5k axle.