4 inch semicircle Barrel with dual handles. Finished inside and out. The Peak Pilates® Half Barrel 4in is a 4in semicircle barrel with dual handles, finished inside and out. Used for spinal extension, lateral flexion, and balance exercises. The 4in arc provides a specific curve depth — choose based on flexibility level and exercise range. Best For Pilates practitioners needing a 4in barrel curve for spinal extension Studios completing their barrel range Home users wanting a portable low-profile barrel option Not Ideal For Beginners without barrel experience — start with instructor guidance Compatibility Note Used with the Short Box on a Pilates reformer. Compatible with all Peak Pilates® reformers that include a Long/Short Box.