Good elastics: Easy on, easy off, no pulling out hair when you remove them. Products passed safety testing and reaches US Standard 4mm thick durable and hard-to-break Smooth Junction: automatically connected by machine , the junction is smooth and neat. Dofash’s metal bobbie pins are one of our most popular hair accessory products. They are a favorite for our customers because of their high quality, affordable price, and ease of use. Our products have a reputation for quality and have been used by industry professionals, but they are easy enough to use for anyone who wants great looking hair.Customer guarantee! if you are not satisfied with the quality of your product, please just contact us within 30days for you.