The original Tekhelet thread According to the Raved, the Tekhelet was produced from the sea snail Argamon blunt thorns!
A set of blue thread contains all the threads needed to tie tzitzis – light blue and white. The yarns are made of selected wool and dyed, woven and woven by hand and for matzot.
Raavad: 2 light blue threads out of 8
Rambam: Wire 1 Azure out of 8
Extras: 4 light blue threads from 8
* Ravad is suitable to tie according to the methods of the Vilna Ga’on, Chinuch, and Ravad
* Rambam is suitable for tying in 7 vertebrae and 13 vertebrae
* Ravad is suitable for connecting Tosafot 7 and Rabbi Amram Gaon
* According to the Tosafot method, two sets of ravad should be ordered