I installed mine in 5 min each...
Yes, my grandchildren have pulled the rubber off. They did not try to eat it.
Best guess is 5 inches.
No only 5.
Currently we do not carry different lengths of this doorstop.
Currently the Satin Nickel Spring Door Stops Value Pack (5-Pack) is manufactured in China.
The dimension of the plate is 0.165” x 0.165”.