SizeThe goof rings for recessed lights come in 6 packs, and fit 2.5-3" Inch recessed ceiling light fixtures, which measure 4.72 x 2.99 x 0.04inches/12 x 7.6 x 0.1cm(Outer Diameter*Inner Diameter*Thickness), Color: Matte Finish White; Material: Steel.Goof Rings For Recessed LightsThis trim ring thickness is only 0.04 inches, its overlay sits flush against the ceiling in between the drywall and the recessed light. Also works with ceiling fans and pendant lights. Steel material, durable to use.Good Quality MaterialThe recessed light trim cover is made of carbon steel material which has high strength and rigidity, can withstand greater pressure and load, and its surface hardness can effectively resist friction and wear for a long lifespan.