The DJI R Lens-Fastening Strap is designed to provide better stability and a more secure shooting experience when using the RS 2, RSC 2, Ronin-S, and Ronin-SC gimbals. This strap is essential for enabling SuperSmooth mode on the RS 2 and RSC 2 gimbals. It features an included knob that tightens the strap around the lens, and its adjustable design ensures compatibility with most lenses, enhancing overall stability during filming.