Ptil Tekhelet is an organization founded in 1991 to provide genuine Tekhelet strings worldwide and support learning about the Jewish mitzvah of wearing Tekhelet on tzitzit. The organization explains that research by rabbis, scientists, archaeologists, and others identified the sea snail Murex trunculus as the source of the historic blue dye, whose production had been lost for centuries. Its online shop offers Tekhelet strings, tallit katan and tallit gadol garments, custom orders, books, and educational materials.

Customers can also find guidance on string options and tying methods, and connect with authorized dealers or the organization’s tzitzit tying bureau for local assistance. Ptil Tekhelet promotes the subject through lectures, workshops, community programs, and publications. Its educational resources include articles, presentations, worksheets, videos, audio lectures, and a reference library, with material for educators, rabbis, and learners of different backgrounds.

The organization also shares information about Tekhelet’s history, production, religious significance, and contemporary rediscovery, and states that its work is under rabbinic supervision