The Chirp Wheel+ provides a unique 4-Way stretch to your shoulders and back reducing muscle pain, improving your mobility and encouraging correct spinal alignment. The medium diameter wheel coupled with Chirp's patent pending spinal canal provide a powerful, deep massaging stretch whether its at the office, after a workout, after a long day in the yard, or as part of your morning and nightly stretch routine. BENEFITS: Patent pending Spinal Canal allows for increased muscle massage Elongates the spine by relieving pressure between the joints Improves posture and mobility Relieves and reduces back pain and muscle fatigue Takes less than 5 minutes a day to roll away the pain in your back SIZES: 6"- Deep Tissue 10"- Firm 12" Gentle