METAL MATERIAL - Made of Metal material with black paint finish. It's quite and not easy to damage. This 25x loop has a len of 1.02 inch diameter. It's a professional work magnifier, great for prescription medications, maps, handcrafts, coins, and also a great choice for those who have low or impaired vision of most types. TWO READING TYPES - Hands free magnifying glass usually, it can stand by itself when your hand is tired. And, it can be stretched to be a Handheld Magnifier, design makes it comfortable for handheld use. RECHARGEABLE - This pocket magnifying glass is equipped with a rechargeable lithium battery and comes with a micro-USB charging cable. It greatly prolongs the working time of LED light and you don't need to purchase batteries anymore! EASY TO TURN ON/OFF - Just Press down the soft silicone button to turn on the 4 white lights for usual magnified observation, press again to 2 UV lights for money detector magnifier. Press the third time to turn off the light. This small jewelers loop be a good helper at work.