There are a few key factors to look for when determining the quality of a skateboard deck. First, look for decks that are made from high-quality materials, such as Canadian maple or bamboo, as these materials are known for their durability and strength. Second, look for decks that have reinforced construction, such as those with carbon fiber or fiberglass layers, as these can provide additional strength and support. Finally, consider the reputation of the manufacturer - well-known and trusted brands are more likely to produce high-quality decks.