What features make the surface of the whiteboard durable and functional?

The whiteboard features a porcelain-on-steel surface that resists scratches and stains, and also accepts magnets, making it durable and functional.

Questions & Answers: Ghent HSM2-48 Horizontal Sliding Porcelain Magnetic Whiteboard - 96" x 48" - White Surface, Anodized Aluminum Frame

The dimensions of the Ghent HSM2-48 Horizontal Sliding Porcelain Magnetic Whiteboard are 96 inches by 48 inches.

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Ghent HSM2-48 Horizontal Sliding Porcelain Magnetic Whiteboard - 96" x 48" - White Surface, Anodized Aluminum Frame

Doubles amount of usable space with fixed back panel and two sliding panels.
Top-suspended panels glide on nylon rollers for smooth operation.
Porcelain-on-steel creates durable, high-performance surface that resists scratches and stains and accepts magnets.
Constructed with heavy-duty anodized aluminum trim.
Includes 2 natural cork map rail.