These are the two that Hondo uses:
https://www.amazon.com/Madeira-Elastic-Invisible-Knitting--Collars/dp/B01CXCS00O/ref=sr_1_5?ie=UTF8&qid=1469517721&sr=8-5
and also:
https://www.amazon.com/PRYM-977770-Knitting--elastic-transparent/dp/B01AHGJQT2/ref=sr_1_9?ie=UTF8&qid=1469517721&sr=8-9
Not finding what you're looking for? Contact Us Directly