Versatile Installation: Suitable for any metal surface such as refrigerators, computers, and whiteboards. Includes a magnetic sheet for non-metallic surfaces such as wood, glass, plastic, or marble. Compact and Convenient: The compact size ensures it won't interfere with your grip. Simply slide it onto the pen's tail for convenient and secure storage. Durable Silicone Construction: Made of ultra-flexible silicone, the dual-directional elastic loop with an inner arc design ensures a secure fit, accommodating a wide range of pens and accessories. Versatile Organization: Beyond pens, these holders are perfect for toothbrushes, sticky notes, charging cables, and more. Compatible with various types of pens, from ballpoint pens to markers, thanks to the recommended diameter range of 6 to 20 mm.