Review on B REFLECTIVE Éco BASIC - 10 Retro Reflective Stickers Kit for High Visibility Safety at Night - Universal Adhesive for Bike/Stroller/Buggy/Helmet/Motorbike/Scooter/Toys - 2 Pack, Black (7 x 1.8 cm) by Dusty Oner

I have a HJC CL-17 in gloss black. I glued these things to everything. They are not visible during the day so the helmet looks the same as before unless you look closely. But shine your headlights on them and they will shine very brightly. I also put one in the wrong place and tried to pull it off. It wouldn't work at all. It may not be good for you, but it was great for me. This means I don't have to worry about them coming loose while on the bike. This season I will buy a new helmet and buy again!