Pencil cap erasers are made of synthetic rubber and are listed as latex-free.
They are designed to fit atop any standard pencil.
Most reviewers report the cap erasers remove pencil marks cleanly and often without smudging.
Reviewers frequently note the erasers offer good value due to a reasonable price and the ample quantity in each pack.
Simply place the cap eraser over the pencil's eraser end and push it on until it fits securely; they are designed to fit standard pencils.