The five factors
The score blends five weighted risk factors, each measuring a different way a collection can lose value or be hard to recover:
How the weights work
Insurance (35%) — coverage versus current market value; it flags the gap between what you are insured for and what your slabs are actually worth today.
Concentration (25%) — exposure to a single player, set, or card. A collection that is 80% one rookie is fragile.
Storage (20%) — climate, fire, theft, light, and handling protection.
Liquidity (10%) — how readily your holdings convert to cash at fair value.
Provenance (10%) — documentation, grading pedigree, and purchase records.
The bands
Scores run A (≥880), B (≥750), C (≥600), D (≥400), and F (<400). Higher is better. Most collections start in the C–D range because they are under-insured — which is exactly the gap Slabline is built to close.
You can build your own score free (up to 25 cards) — add a few slabs by scanning the label and Slabline values each from real comparable sales.