A collection of Purple, Pink, White, and Green Urchins complete with air plants.  The Pink, Purple, White, and Green Urchin shells measure about 1.5 to 2 inches wide and 1 inch tall. The Ionathan air plants are about 1.5 inches tall. No glue or filler needed. The air plants fit perfectly in these cute little shells. The variety of urchins sent depends on the availability at the time of purchase.