Each Spectrum Noir pen is double-ended, with a broad chisel nib for large area fills and a fine bullet tip for detailed work. This 12 pack of replacement nibs contains six fine bullet tips and six broad chisel nibs. This is an easy and affordable way to refresh your markers if the nibs become frayed, worn or lost. Please note: These nibs are not the same size and shape as the nibs in the Last Generation Spectrum Noir pens. For more information about the range of Spectrum Noir products visit our dedicated Spectrum Noir page by clicking here. Age 14+