These sanding pens are fantastic! They are Renee's favorite way to sand small errors in her pyrography art. These pens sand out overburn (or the brown "halo" when you burn too hot), dried paint, glitter, and other color mistakes in your wood art. They have dozens of uses from automotive car work to welding motherboards- it's very versatile.

When you go to use it, just *barely* turn the white end out so it's just peeking out of the pen, and then use it. This will create dust rather than broken fibers fibers. This is what you want.

You HAVE to be careful when using one of these because if you turn out too much of the white point, those little glass fibers will break off as you're using the tool and can get stuck in your hand like fiberglass or insulation. They really hurt. They're like glass splinters and are very hard to see.

Use a microfiber towel or an old washcloth to wipe the dust off of the wood. Don't risk getting those little glass shards in your hard!

This tool is better than sandpaper, so Renee has learned to use it without getting splinters anymore.

There is a sanding tip refill in the black twisty end of the tool which is very nice.

Below is the product description found on Walmart.com:

"The glass fibers in PrepPen are finer than human hair yet stronger than steel when it comes to cleaning power. The glass fiber cartridge can be extended out by turning as needed, then easily retracted when not in use. The refill is conveniently stored in the handle. Sand paper can be too rigid to directly contact and clean contours of inside edges. Conventional sanding only hits the high spots. PrepPen's glass fibers get into the smallest recesses. Save time and money by replacing folded sandpaper with PrepPen

['', '20,000 glass fibers in a pencil point - replaces folded sandpaper.', 'Extra glass fiber cartridge stored inside.', 'Use for any precision spot sanding and cleaning - electrical contacts, paint, auto detailing, etc.', 'Reach where sandpaper can't - hundreds of uses - auto, shop, home, industry.'"