Summary: Ok - it's an order of magnitude better than the shipping cover that comes on a lense. It's strong, would like to see a small rubber seal at the end to ensure dust stays out for extended periods of storing a lense.
Summary: Order came the first day on the estimated dates range. Speedy delivery. The item fits my Nikon D3100 perfectly. Will most likely be ordering myself more of these rear lens caps when I get more lenses.