This is a NEW padded seat with springs. The picture shows that it has the recommended low place in the middle of the rear part of the seat with the raised pads on both sides of the low place.
The springs are the usual kind that are under the seat. The seat has black vinyl covering. The width of this seat is about 10 1/2". The length (front to rear) is about 10 1/2"'
It has double steel rails that are 7 mm diameter. You can also put this seat on a post that has a built in clamp.
This seat has a standard clamp that fits seat posts that have a diameter of 7/8" at the top of the post where the seat clamps on it. All of the seats that you see in bicycle shops and stores have a 7/8" diameter clamp like this seat. This clamp will also fit the slightly smaller diameter 13/16" post.
This seat clamp will fit the seat post on almost all bicycles, but some very old bicycles have seat posts that are about 5/8" diameter at the top and this seat and no other seat will fit that size seat post without some modification.
If you want to measure the diameter of your seat post to be sure that this seat will fit it, you will need to take off your seat and measure the post at the top. See below for "How to measure the diameter of a seat post".
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>> HOW TO MEASURE THE DIAMETER OF A SEAT POST: Close the jaws of an adjustable wrench on the seat post. Then, measure the distance between the jaws.
A more accurate way to measure the diameter of a seat post is to cut a strip of paper that will exactly go around the seat post, which will be the circumference. Measure the length of the strip of paper and then divide by 3.14. The number that you get will be the diameter of the seat post. If the circumference is 3.14" or 79.756mm, then the diameter is 1" or 25.4mm. If the circumference is 2.7475" (about 2 3/4") or 69.7865mm, then the diameter is 7/8".