Westcott's retractable hobby knife is designed to cut through photos, paper and plastic. Even better, the CarboTitanium blade retracts for easy storage! Perfect for at-home or in-office use, these CarboTitanium-bonded hobby knife blade catridges are 8 times harder than untreated stainless steel blades. Our patent-pending process creates a permanent molecular bond with the cutting surface so blades resist scratches, marks and stains. The blades will stay super sharp and smooth-cutting for years, making them an exceptional value like all Westcott products. Creating your next masterpiece is easy when you have the very best tools to work with. Westcott, the leader in cutting technology, is dedicated to supporting education and inspiring creative activities at home and in the classroom or office. Designed to help you bring your ideas to life, our fun and functional tools feature superior quality and offer exceptional value.