These StikkiClips stick to any surface with fingertip pressure, including brick, cinder block, plaster, wood, metal, plastic, etc. They remove with just a twist and can be remounted again and again. The adhesive won't damage walls or materials and never dries out. These clips are better than glue and tape, safer than push-pins, staples and tacks. They are also great for notes, lists posters, schedules, decorations artwork, projects and much more.Details: White 36 packs (20 clips per pack, 720 total clips) Plastic