This query describes a specific and somewhat unusual set of specifications for a pocket spring mattress

 system. Let's break down what this likely means, clarify the terminology, and explain what you should

 look for.

Clarification of Terms

First, there's a small terminology issue to address:

• Diameter: Mattress dimensions are referred to by their Length and Width. "Diameter" is used for

• circular items. The measurements provided (198cm to 230cm) are standard mattress widths for

• larger sizes.

• "198cm to 230cm Diameter": This phrasing suggests a spring system that can be customized or

• is available in a range of widths to fit different international mattress sizes.