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| | Bowling |
 | | Duckpin bowling, commonly found in the mid-Atlantic and northeastern United States and eastern Canada, is a variation of ten-pin bowling involving small, squat pins, sometimes with rubber at their widest points (rubber band duckpin bowling). |
 | | Bowling ball materials, during the history of the USBC, have evolved from wood, to rubber, to plastic, to urethane, to reactive urethane, to particle, and to epoxy. |
 | | Bowling balls have been constructed with a core made of one material, a spherical coverstock ("cover" or "shell") and a "pancake" weight block of denser material intended to compensate for the gripping holes. |
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