Gel-ocity Retractable Pens offer an easy-to-handle contoured grip for writing comfort & smooth-flowing gel ink to deliver quality work. Very low pressure is required for smooth writing. Tungsten carbide ball is a perfect sphere & very resistant. Rubber grip allows comfort & control. Clear tinted barrel makes it easy to see ink supply & matches ink color. Plastic clip easily attaches to notebooks & pockets. PVC-free pens are refillable.