Short answer: on the standard list, size lines up with the sheet, back and profile: the 31 standard sizes fall into only three combinations. Up to 256 square inches: 0.5 mm PVC, 1.5 mm back, Slim profile (18 sizes). From 288 square inches with a longest side up to 24 inches: 1 mm acrylic, 2.1 mm back, Classic (8 sizes). Longest side 28 inches or more: acrylic, 2.1 mm back, Broad (5 sizes).
The three bands
| Band | Sizes | Front sheet | Back | Profile (front / depth) | Area range (sq in) |
|---|---|---|---|---|---|
| Small | 18 | 0.5 mm clear PVC | 1.5 mm | Slim 19.5 / 13.5 mm | 24 to 256 |
| Medium | 8 | 1 mm clear acrylic | 2.1 mm | Classic 21 / 15 mm | 288 to 576 |
| Large | 5 | 1 mm clear acrylic | 2.1 mm | Broad 28 / 12 mm | 450 to 864 |
What follows from the rule
- 18 + 8 + 5 = 31: every standard size falls in one band.
- There is no standard size between 256 and 288 square inches, so the PVC-to-acrylic switch happens in a gap in the list.
- Choosing a different profile or sheet on a standard size is a made-to-brief request, confirmed in the quote; Fine is made to brief.
- To compare two profiles fairly, ask for both on one size, because across the standard list the sheet, back and profile all change together with size.
This is our reading of the published list, not a promise for sizes made to brief. Full table with millimetres: frame sizes as data. Profile detail: profiles compared.
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Sources: photo frames [S5]; photo frame profiles compared [S19]. As of 2026-11-12. Terms are typical and are confirmed in your written quote.