aluminum core hair roller ♥ material: nylon micro hook+aluminum core ♥ specification: Ø: 28mm 32mm 36mm 40mm 46mm ordinary length: 60mm special size can be customized as per customers requirement.♥ certificate: SGS ISO9001 . conform the European environmental standards. ♥packaging : 6pcs/pack packaging quantity: according to the size of each hair roller carton size: 62 71*46*41.5 ♥ species: plastic hair roller, aluminum hair roller, three-layer hair roller, ellipse hair roller, sponge hair roller, docking hair roller, sponge hair roller ball ♥feature: special nylon micro hook surface can fasten your hair strongly,and won’t loose easil, no need for any hair clip.Resistancehigh temperature, it's with aluminium core,canspread heat to hair widely.No harm to your hair and skin.Use environmental non-toxic material to dye,do not fade even thoughit contact the water. ♥ usage: you just need to roll up your hair up with the hair roller,easy to use and,light and convenient and practical. ♥many different specification and color design for your choice OEM and special designs are welcome. welcome to inquiry!