Our loops are designed to be more durable and comfortable. They are made from high-grade, low-odor rubber and we offer 2X10”, 2X12” & 2X20” because we found that the 2X9” broke too frequently. Our tension ranges are slightly higher than our competitors for a thicker, more durable product. (Our blue is equal to competitor’s black, it is a 2X12” which makes its expansion-tension rate further)