Permanent markers feature a retractable design that uses a seal mechanism that automatically covers the tip for easy access with just a single hand. Pocket-safe clip self-retracts when clipped to prevent creating random marks. Nontoxic, low-odor ink helps prevent irritation for safe use. Refillable design can be used with Pentel refills (sold separately) to reduce waste. Permanent markers in assorted colors are perfect for marking on wood, drywall, tile, concrete & more.