EnduraGlide dry-erase markers offer a patented three-chamber technology that delivers bold, continuous color on dry-erase boards, ceramic, glass & other nonporous surfaces. By sending ink straight to the nib from three separate pressurized chambers, markers flow more steadily, write smoother, & erase cleanly. Convenient see-through barrel shows exactly how much ink is left. Roll-resistant cap prevents markers from drifting out of sight. Low-odor, nontoxic, quick-drying ink erases cleanly.