Learning to use a butterfly can be a dangerous and even painful experience. Now, here's your opportunity to learn to manipulate a butterfly without all the scar and bandages. This butterfly training has a dull-edged black finished handle with weight reducing cut-outs.It is not sharp and it cannot be sharpened due to the design. The handles feature pin and channel constructure and look extra thick.But they are skeletonized designed to reduce weight.So they are not too much heavy ,have a good feel in the hand, and won't slip. NOTE: If you are new to flipping a butterfly trainning,we would suggest practicing your flipping tricks by standing facing towards a bed,a sofa, on a carpet or lawn to avoid damage. Suitable for hiking,camping,cycling or other outdoor activities. Wish you have a good time with these butterfly knives.