Natural Cork Bulletin Boards Ghent's natural tan cork bulletin boards are a traditional favorite, thanks in part to their ability to withstand the wear and tear of repeated tacking. Push pins, staples or tacks can be easily inserted and hold firmly. The fine-grain cork surface is laminated to a sealed-back fiberboard to create a cost-effective, long-lasting bulletin board. Ghent's natural cork surface is self-healing and will maintain its smooth, attractive appearance for years. Ghent's natural tan cork bulletin boards carry a five-year guarantee.