Malchot Dovid Straps (Retzuot) are certified by the Badatz Beit Yosef and European Kosher Organization. Each Roll of straps comes with documentation of both letters of certification (Hechsherim).

Zonnenfeld Straps (Retzuot) are certified by the Badatz Edah HaChareidis of Jerusalem. Each Roll of straps comes with a number which can be crossed reference with their agency to ensure certification.