The set includes one 30x 21mm chrome loupes and one 10x&20x dual loupes * The 30x power loupe has a focal distance of 1/2" (13mm) with 21mm dia lens size * The dual loupe is 10x power with 18mm lens size and 20x power with 12mm lens size, the strong magnifications with a mid distance of 1/2" * Made of optical glass and protected when not in use by the swing-out chrome plated metal cover * Both loupes come in a protective plastic case