Glass: Often used for high-end cosmetic products due to its ability to preserve the quality of the contents and provide an elegant look.   Plastic: The most popular material for roll-on bottles due to its affordability, versatility, and lightweight properties.   Stainless Steel: Known for its durability and resistance to corrosion, making it a great option for roll-on bottles that need to withstand harsh conditions.   Aluminum: A lightweight and recyclable material, often used for roll-on bottles that need to be transported easily and securely.   Ceramic: Used for roll-on bottles that require a unique and decorative design, often seen in luxury cosmetic brands.