This package contains four thin blue threads sufficient for four corners of tzitzit. The tops of each string are white. They are prepared in accordance with the custom of Radzin and bear its certification. White strings are sold separately.
Due to the special nature of the blue dye it may rub off onto your fingers or on to the tallit katan as you tie the knots. This is perfectly normal and is part of the unique nature of the thecheiles (techelet) dye.
100% Kosher