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 Expander Material: Acrylic Features: Double O-Rings, Flexible, Hypoallergenic Size 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