Orion 05514 Basic Set of 1.25-Inch Four Color Filters (Black) Handy color planetary telescope eyepiece filters help enhance your view of the planets and Moon, unveiling specific features and enabling you to discern more detail High-grade Schott optical glass is vat-dyed for even color coating, then anti-reflection coated for maximum light throughput Anodized aluminum cells are double-threaded to permit filter stacking for multiple filter use Includes 15 Deep Yellow, 25 Red, 58 Green and 80A Medium Blue Each filter has a metal filter cell and is threaded for use with Orion 1.25 inch telescope eyepieces and filter-threaded accessories