This is a good deal on a set of light-weight replacement or extra lens caps -- this is a set of three and each includes a leash (the band fits around my lens and does not obscure the markings + the disk has a small pad that adheres to the cap; just remove the paper covering and stick it in place).
I have two older Pentax film cameras (I guess they are considered vintage, now -- sounds better than obsolete, anyway). They are actually the same model, one belonged to my father and I later chose the same one when I started getting interested in B&W photography. The original lens cap on one of them was lost long ago, but the camera is kept in one of those fitted cases so the lens was protected. Unfortunately that case is now falling apart and I found this kit which seemed perfect for my needs. Most lenses are marked with a Chi symbol followed by a number designating the diameter of the lens (as shown in the pictures in the product description) but not all lenses have this, and as it turns out, mine do not. It is possible to measure them using a metric ruler or tape measure, but being very much an amateur photographer, I wanted to be absolutely sure, so I looked up my 50 mm lens online. It turned out to be a fairly popular one for the time (30+ years ago) and I found a website that showed all of the specifications, so I felt confident ordering the 49 mm version. These caps are not as robust as the original ones -- they thin and lightweight but they are easy to position (just pinch the slides on each side to install or remove). They fit securely on my lenses don't pop off easily and I feel that the glass I well protected. I really like the leash, as I am always losing lens caps that don't have them (I take them off and put them in my pocket or set them down and forget where). I really ordered this set just for the lens caps and I really like that there are three of them, so I have extras. The microfiber cleaning cloths are of very good quality, too. There are three and each is packed in a separate foil packet. The squares are a good size (about 6" X 6") and are a very fine gauge, very soft and silky. They are a welcome addition to my camera accessory kit. The current price of $14.99 seems very reasonable to me.