Pentel's Ain Stein lead is made to be stronger and less susceptible to breakage than traditional mechanical pencil lead. Available in .2, .3, .4, .5, .7, and .9mm sizes and a variety of densities. Also available in .5mm Blue and Red colored lead. The cap is opened by twisting part-way to the side, so you will never lose it.
Please note: Some variants may no longer be available. Pentel is in the process of discontinuing this product, and replacing it with the Pentel Ain Lead.
