Answer
The best material for an oversized check is 3mm PVC (good) or 6mm PVC (best).
Eco Board is corrugated plastic material with a smooth surface that is best for one-time use or a limited budget. This material is not recommended for dry erase.
3mm PVC Sintra is a lightweight, slightly flexible PVC plastic. It offers a smooth surface and solid core making it ideal for dry-erase checks and large events.
6mm PVC Sintra is the same material as 3mm PVC only thicker (.25”) and more rigid. This is the highest quality material. It is ideal for multi-use checks and dry erase checks. 30”x60” checks or large can become very heavy.
Snap Board is a rigid white plastic that can be rolled or bent and will spring back to a flat position without breaking. It ships rolled up with rope to reduce the cost of expedited shipping and is ideal for extra-large oversized checks (like 30" x 72") or if you must travel with the product for a presentation. Can be used with dry erase.