Add instant high-visibility safety walking, running or biking after dark Thin metal band automatically coils around arm, leg, bike frame; rolls into ball for storage Weather-proof high reflective vinyl on outside, soft micro-fleece inside Perfect for keeping pant leg out of bike chain; each weighs 0.5 oz Set of two 12" x 1-1/4" bracelets fit adults or children, one each orange & green fluorescent