Found this item while wandering aimlessly down the aisles at the local Michael's franchise in Silverdale, Washington.
Product is sold in quantities of 10s yard (36.0')/9.1 Metre lengths and is 1.5mm/0.06" in diameter. It is available in several colors including black (the color I purchased).
It is small enough in diameter to be useful for hoses, electrical cables or similar in several scales.
Product number is: 886946854043 (derived from the bar code on back of item).
Product name/description is:
Creatology
Spikeez Silicone Cord/Cordon En Silicone 0.06 in (1.5mm) diameter / diametre 10 yd (9.1 m)
Of course searching Michael's for the same product to provide a link was pointless as nothing came up. Google was also a dead end. Attached image is the best I can do to show what it looks like.