They are made from rubber, as indicated on the packaged eraser sets.
They typically come in small multi-packs; examples shown include 6-count and 8-count packs.
They're compact and pocketable—about 2 to 2.5 inches—so they’re easy to toss into backpacks or pencil cases.
Sizes shown include about 2 inches tall for assembled 3D puzzle erasers and about 2.5 inches long for beveled pencil erasers; widths near 1 inch and thickness around 0.38 inches are also listed.
They come as flat/beveled pencil erasers and as collectible 3D puzzle-style erasers that assemble and disassemble for play.
They offer collectible 3D puzzle forms that assemble and disassemble, novelty scents on some 3D erasers, bright color ranges for beveled erasers, and compact sizes for backpacks or pencil cases.