7 sizes, 7/8", 11/16", 5/8", 9/16", 1/2", 7/16", 3/8" of 42 pieces, length: 18 cm,random colorMaterial: foam, suitable for wet & dry hair of all types and textureFoam design: easy-to-use, comfortable to wear while you sleeping, no damage to the hair rootRollers design: strong tp keep your hair and easy to DIY bouncy curls and waves, design salon hairUltra-light design, convenience, take-to-go package with zipper for efficient storage