Available in Different Variations
The Ptil Techelet (or Petil Techeilet) Tzitzit are made according to two different ways. The Rambam tzitzit are only half blue threads (the other half are white). The Ravad Tzitzit are completely blue. Both are available in thick or thin.
All Techelet are Avodat Yad, Kaful Shmoneh, with dyeing and spinning done by hand.
The authentic Techelet (Tekhelet) dye comes from Murex trunculus snails. These sets of 16 strings in each package come in your choice of the two (2) different opinions of the Rishonim.
See options below. Read more about Techelet.
All Tzitzit Chutim for all four (4) corners, the whites and the blues.