This Sewline Aqua Eraser works rather like a fountain pen with a reservoir you simply fill with water.
Your finger pressure on the soft grip dampens the special soft fibre point. By lightly dabbing or running this point along the line or mark, the special point absorbs the pencil or water-based ink mark. Quicker and easier than using a sponge or cloth.
When the point of the Aqua Eraser becomes discoloured, simply pull it out and slip in a new point.