Guru Refill Micro Cubes Refill

The shape makes them very durable. In fact, they never "ping" at all! Super soft and user-friendly, there's a wide range of sizes to choose from. Can be placed on even the thickest lines and they can be moved easily without damage. Features: Convenient dispenser, Center and deep stroke, Made of lead, rests perfectly on your line, Very durable, thanks to the super compact cube shape.