I purchased this to replace an uncomfortable Timex Expedition resin watch band. Both the 2 and 4 ring bands have the same thicker nylon webbing, good stitching, and stainless steel hardware. The two included replacement pins are a nice bonus.  There are less expensive products that appear similar, but may not be equivalent.

The the 4 ring is designed for deep sea divers, special forces, test pilots and astronauts.  The 4 ring is a really nice product, but bulky and overkill for what I do. I also purchased the 2 ring version which I like better. Unless you have a huge watch and/or wrist, I suggest the 2 ring version.