These ropes are 10mm or 3/8" thick.  Spun Polyester rope with braided rope core, white, heavy rope.  Great choice for parlour or stage.  This is a new item and limited for now.  Hopefully you like it enough that we continue to stock. 
Pop Haydn says..."I love it! Your BTC-5 rope is superb! I have been using it all the time. Sure looks good in the photos! I like the tighter weave, the ends don't fray quite so fast as with the BTC-4 which I have used for many years. "