View on LOZ Suggested Retail: $49.99. ENERGY FLOW, Back Roller, Back Stretcher & Spine Cracker For Back Pain Deep Tissue Massage Yoga Back Roller Yoga Wheel For Back Pain Relief Stretching Strong & Improving Flexibility Of Your Back. The only back cracker made by a chiropractor, this yoga wheel works well on all areas of the back - from the neck down to the lower back. With its patented bump pattern and a gap in the center, you won’t feel any pressure on your spine.The Spine cracker is made of high-quality foam and plastic inner core, our patented back roller is bigger - and better - than any other roller. It can hold as much as 1000 pounds. Whatever your body weight, this is the perfect back roller and stretching equipment for you.. 7 CALENDAR DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.