Made of safe and durable food-grade silicone and stainless steel materials, , safe . The surface is smooth, non-sticky, rinsed with water and easy to clean. The folding thickness is only about 4cm, which is convenient to carry. You can hang it on your backpack. Good sealing design ensures no water leakage on bumpy roads. The tapered body design provides a better grip. specification: Product Name: Silicone Folding Cup Material: stainless steel + silicone Capacity: 500ml Size: unfolded size: 18x9.5cm; folded size: 4x9.5cm Product weight: 150g Packing: 1 outdoor sports bottle Please note that due to the difference in lighting and computer monitors, we cannot guarantee that the actual color is the same as the picture. Due to different measurement methods, there may be an error of 1-2 cm.