Made of high quality, safe and environmentally friendly materials, this product is the best choice for people who have allergic reactions to metals.Featuring a smooth surface, light weight, durability, no odor, and hypoallergenic, this product ensures your health while expanding your ears.It is constructed of acrylic material.There are 9 sizes for you to choose: 1.6mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm.It is a great gift for friend and yourself.Item Name: Ear ExpanderMaterial: AcrylicFeatures: Double O-Rings, Flexible, HypoallergenicSize Details:Style 1 Length: 0.16cm/0.06" (Approx.)Style 2 Length: 0.2cm/0.08" (Approx.)Style 3 Length: 0.25cm/0.1" (Approx.)Style 4 Length: 0.3cm/0.12" (Approx.)Style 5 Length: 0.4cm/0.16" (Approx.)Style 6 Length: 0.5cm/0.2" (Approx.)Style 7 Length: 0.6cm/0.24" (Approx.)Style 8 Length: 0.8cm/0.31" (Approx.)Style 9 Length: 1cm/0.39" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:50 x Ear Expanders