Hermit Crab Shells Medium to Large Growth Turbo Seashells 1″-2″ Openning Size… on July 14, 2026 July 17, 2026 Size Range: Openning size 2.5 -5 CM,The Shells size 5.8-9CM,6 different color-sized shells are available for your hermit crab selection. Therefore, it is significnat to prepare various seashells for your hermit crab.