VERY100 7Pcs Needles Felting Tool Needle Felting Pen for Wool Yarn Fabric Felting Craft Art Total length: about 90mm; There is a red dot on the transparent tube shape cover When the red dot on the cover align with the red dot on the blue handle, the cover can move up and down with a spring loaded This is to protect the user from touching the needle and get hurt while allowing the cover to go up when the user plunge the needles into the felt When the tool is not in use, just turn the cover until the red dot does not align with the red dot on the blue handle, then the cover will be locked unmovable In the photo, the cover was frozen in a stay-up position, this is just for showing the needles. The cover is actually loaded with a spring, it cannot (and doesn't need to) stay up as shown in the photo