HIGH QUALITY MATERIALS: Made of food grade stainless steel 304, durable, rust resistant, corrosion resistant, dishwasher safe. COMFORTABLE EXPERIENCE: The surface is polished with smooth edges to prevent scratching your hands. The interior is polished and brushed for easy cleaning. These stainless steel shakers are more durable and last longer than plastic or glass shakers. Bottom Reinforcement: This oscillator has a better seal to prevent leakage. WIDE APPLICATION: Can be used to shake a variety of drinks such as cocktails and wine. Shakers are very suitable for hotels, family, bars and other places, especially professional bartenders.