Key-Write Plastic Assorted Key SleeveKey Write Key Id Sleeves Sleeves Are Colored Heat Shrink Plastic Slide The Sleeve Over The Head Of The Key And Apply Heat While Holding The Sleeve In Place The Sleeve Shrinks To Form Fit The Key Head Providing A Writable Surface The Best Pen For This Use Is The Sharpie Industrial Yellow, Red, Blue And Green Clamshell 24 Medium And 24 Large Includes Sharpie Pen All Items Sold New In Original Packaging