The Smart Ties are a one-inch diameter 1/8" foam adhesive backed Microprism that have a laminate of 3M microprism on the front. When running a traverse you no longer have to choose between running it quickly e.g: regoing referencing, or taking the time to reference your control. Now your can do both with Perm A Site Smart Tie. Smart Tie has a range of 150 feet with a Sokkia Set 3 B II; three times the typical chain tie distance. The Microprisms have a zero offset and are weatherproof and reusable. More information on the web site Comes 100 ties to a bag.