This tool performs really well, practically, as well as safely. Retractable needle design keeps pokes to a minimum. In addition, due to the design, perfect depth and uniformity is achieved with each stroke. Needles are, of course, replaceable. This handy little tool can be quite the workhorse by combining multiple needle variations (triangular + star, etc.) when using. This tool is also perfect for project bags and small bags on the go, little risk of getting poked when reaching for, or moving around with your bag.