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Hi israelgd,

There are many different trade names for the various spring manufacturers for their own specific designs and variations upon these general themes/categories. VertiCoil is a trade name from Leggett and Platt, and this spring unit is made in different coil densities, profiles, wire thicknesses and spring arrangements. Here is a link and another to the VertiCoil site. The 460 refers to the spring count in a queen size. It’s a 357 in the full size, and 357FE if it is used with a foam edge encasement system. The 460 can be a quite sturdy unit, depending upon the configuration the manufacturer specifies, and it is commonly used in mattresses in the entry-to-mid price ranges.
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If you’re curious, there is more about the different types of innersprings in this article and in post #10 here, but I would pay much more attention to your own careful and objective testing which will tell you how the innerspring performs in combination with the other layers and materials in a mattress. The quality of the materials above the innerspring is normally the weakest link in a mattress, not the spring unit.