The combination of Smart-Use advantages makes it so unique!SMART: Permanent marker and deep hole marker in one Combines strong and highly visible markings with pinpoint accuracy Suitable for all glossy and dry surfaces Special soft and shape-sturdy tip: provides an unique writing experience SMART: Always and everywhere at hand Thanks to the innovative quiver cap the marker is always to hand One handed handling: the quiver cap always stays on the trousers SMART: The "TWIST & REVIVE" writing tip for life extension The TWIST & REVIVE writing tip can be completely turned around for a quick revival The large XL ink reserve can thus continue to be used up The stainless steel tube around the writing nib ensures clean fingers