The Vivitar Series I 31-9740 Rubber Compression Lens Hood is a circular lens hood designed specifically for 70-210mm f/3.8 lenses. Made by Vivitar in Japan, this lens hood helps prevent lens flare and glare by shielding the lens from direct sunlight. The rubber compression material ensures a secure fit onto the lens, providing protection and stability during use. Perfect for photographers looking to improve image quality by reducing lens flare and glare.