CL-4010 This product absorbs sunlight and glows in the dark for up to 12 hours. Simply expose the nylon adjustable collar to the sun, turn out the lights and watch it glow. This collar is adjustable, non-toxic and UV-safe. Features: -Spectra-Glo Glowing collection. -Machine wash, air dry. -Made in the USA. Dimensions: -Product weight: 0.1 lb.