Pre-inked Flash Stamps – “This Work Was Completed” and “Learning Objective” checkbox grading stamps Excellent for grading tests, homework, work in classroom, schools, art, science, music, PE, math, and literature classes. Inspire, motivate and communicate clearly to students in kindergarten, elementary, middle, high school, daycare, and any educational setting, etc. Keep students interested in learning while providing them a fun and exciting environment. Perfect classroom must have teacher appreciation gift idea for your teachers, educators, professors, instructors, as prizes, and holidays. No ink pad needed – These flash stamps re-ink themselves. These stamps can also be easily refilled. The ink is water based, non-toxic, and safe for kids. Dries quickly and leaves a clear impression. Note: Some contents may come loose during transit. Due to storage conditions, environmental factors, and other conditions out of our control - the stamp ink may dry out faster than normal. In this case, please consider our Stamp Joy ink refills located on our Amazon store. Support Veterans and Local Businesses – Tacticollar, Stamp Joy, Stamp Enjoy are subsidiaries of Good Origins a 100% Military Service-Disabled Veteran-Owned Small Business. With every purchase, you contribute to non-profit veteran organizations or events. We are deeply committed to supporting students, teachers, doctors, nurses, and first responders. Stamp Enjoy - Self-Ink Flash Stamp Set, Multicolor Teacher Stamps, Office Stationery Stamps, Pre-Inked