Faber-Castell Glass Eraser Pen

The external feels nice and sturdy, but on closer inspection of the internals, you can see a number of 'value engineering' design choice.1) The actual holder of the glass fibres replace tip is made from 0.05mm thick plastic, this will break if you are not gentle when replacing the tip. If this breaks, there's no replacement part.2) The holder is fraction fit, this requires you to push the the tip into place with a decent amount of force, enough force to get stabbed by stray glass fibres! Always wear gloves when replacing the tip to avoid injury.I bought this for £4.6 (close to 1/2 price) from Amazon Warehouse, so I am not fussed about these disadvantages.

Bought to remove paint from figured glass in borrowed light panels above doors.Previous painters weren't too careful and there was a lot of overpaint - very difficult to get off of the patterned side of the glass.Fibre glass eraser helped enormously.

Bought this fiberglass scratch pen to clean some electronic terminals in a vintage multimeter, works great, little effort is used to remove tarnish from hard to reach places, hand and eye protection and a face mask are a must as some tiny fiberglass particals can be expelled from the end.All in all great little tool for tarnish removal of battery terminals and corroded solder joint cleaning for resolder.

Brush runs out very quickly it’s only about 10mm long, there are other glass erasers on Amazon half the price and brush is much longer therefore will last longer

Great for removing our pen/pencil mistakes when crafting, if we can't get the mark off with normal rubbers/erasers.Much better than scratching with a knife, I've used one for years, but lost it and managed to find this one.As I believe the 'knib' is fibre-glass, so, for safety, I would not let a young child use it, unless being supervised.