Takes tube training to the next level, using Braided Tubing Technology to weave together four strands of SPRI's Tuff Tube. Perfect for higher-demand tubing exercises that regular tubing just can't handle. The Braided Xertube comes in 5 varied resistance levels-each level is marked on handles. A silver metallic color braided together with colored tubing makes it easy to differentiate between other resistance levels and from the longer version, the Braided Xertube Plus.