One small roll is 50 meters long and one large roll is 300 meters long. By default, for shipment, 2 small rolls mean 1 roll of 100 meters, 4 small rolls mean 1 roll of 200 meters, and 12 small rolls mean 2 rolls of 300 meters each. It's also not ruled out that all the items sent to you are 50 meters per roll. If you need a 50-meter or 100-meter roll, please inform the customer service in advance of your requirements