Sterile scalpels with blades that retract into the handles. Made of surgical steel, the scalpels are the most popular size with #10 blades. Push the slider forward to lock the blade in place before use. Push the two side buttons and the spring retracts the blade completely into the handle for safekeeping. Blade will stay retracted allowing for safe disposal. Ridges along the side of the handle keep hands from slipping along the handle during use. Package of 5.