XMark Tricep Rope Cable Attachment XM-3657The XMark Tricep Rope Cable Attachment XM-3657 provides more of a challenge than static tricep attachments and is well worth the investment. Ideal for a range of arm exercises as well as abdominal crunches, the XMark Tricep Rope XM-3657 allows more flexibility to completely follow through with each movement. Sculpt, build and define your body with XMark, the mark of excellence.