It is called SturdyFloss. It was created by a dental hygienist.
SturdyFloss has a rigid but bendable threader tip which is thicker than other types of floss with built-in threaders. Because it is thicker, it is easier to handle. You can bend the threader into a specific shape and it will stay that way. It's a great product for kids who may have difficulty getting a grip on the other types of floss threaders.


The floss itself is plain (unwaxed, unflavored, unscented). The threader is "built in" to the floss in a similar way to Glide Threader Floss and similar products, but as I said, it is thicker and you can bend it into any shape.
I am willing to send one free sample strand to ArchWired readers for a limited time. Please be patient, I will be very busy in mid-March and may not be able to mail your sample for a couple of weeks at that point in time.
For a free sample, email me at: archwiredsamples@yahoo.com. Be sure to include your full name and full address and zip/postal code. Samples will be sent US first class mail or regular international airmail. One per person, please.
If you just want to buy it, it is available in a box of 100 strands for $13.99 Here is the product page on DentaKit.com:
http://www.dentakit.com/sturdyfloss.html