If a defective product caused or contributed to the injury a claim can be made against the manufacturer and occasionally the seller of the product. The defective product might be a household product that catches on fire, a medical device or drug, an automobile or the design of a product. The failure to warn of a defect or danger can be the basis for a product liability claim. These types of lawsuits often allege breach of express and implied warranties of merchantability or suitability. The first lawsuits to prove a defective product are very expensive and complicated and some are filed as class-action lawsuits