Giacamo,
A wrist thong is an option on any cuctomer wood...or shop-supplied wood for "any" CDT knife. A standard Model #14 (full, exposed tang model) comes with the wrist thong included. It will count as one of your 5 options on the CDT, as will the Tenite. I don't believe I've ever seen red tenite. Do you have a photo?
Hope this helps, Capt. Chris