All brushes and needles are 4 inches long, dishwasher safe, and constructed with stainless steel and nylon bristles. Each set of 10 needles and 5 brushes comes with a detachable key ring for quick and easy access. All brushes have a convenient loop at the end of the handle to hang when not in use or to reattach to the key ring for safe keeping. Special design for gap and blind angle you could not clean well with normal tools! Also perfect for cleaning Drink Straws, Hummingbird Feeders, Airbrushes, Paint Spray Guns, Tattoo Equipment, Small Nozzles, Keyboards, Sewing Machines, Carburetor Passages and so on.