This product is used for B0: Fits 2" Max Foot Width B1: Fits foals 1 to 6 weeks, 2 3/4" Max Foot Width B2: Fits foals 6 to 12 weeks, 3 1/4" Max Foot Width When to use: Early stage of club foot syndrome. Most club feet develop 4-8 months of age. Early detection is vital for maximum results. Protects the coffin bone from trauma. Reasons for using wedge: Easy to apply Quick results Reduces strain of deep flexor Prevents bruising and abscesses Reduces dish formationfoals with club feet.