1. 2.Made of Metal, and design, in the back of tack clip have a pointed push pin, so you can fix the clip into someplace, more convenient in using 3.Office and home: for holding up your documents, artworks, school projects, photos, notes, papers, ticket stubs, decoration and to-do-list 4.combine the metal clip with push pin, clip the papers or whatever you are trying to pin without hole 5.Suitable for cork boards, bulletin boards and cubicle walls for office school home and no holes for the paper Manufacturer . Type:Thumb Tack Colour:Black Material:metal Size:3x3.1CM Package Contents: 150x Clamps Office Clips Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.