Whiteboard erasers typically use soft felt or plush cleaning surfaces, sometimes include built-in magnets to stick to boards, and come in comfortable shapes and bright colors designed for frequent classroom or shared use.
Pencil cap erasers are typically made of synthetic rubber and are described to fit standard pencils. They are commonly sold in multi-count packs intended for students and teachers.
Some retractable push-button pencil erasers include refill erasers and are sold with refills (often two refills per eraser). Product descriptions commonly note using the push button to insert or remove refills.
Features that aid use include sizes and shapes suited to small hands, lightweight construction, clips to attach retractable erasers to notebooks, and comfortable contours for frequent classroom use.
Several pencil erasers are described as smudge-free, self-cleaning, and resistant to tearing paper. Some listings highlight beveled ends and note formulations (supple or hard rubber) that promote clean erasing.