Sea Urchins (Alfonso) 2 1/2 to 3". Imagine holding a piece of ocean history—these Alfonso sea urchins are nature's tiny treasures, each one a perfect sphere of intricate timeless beauty. Ranging from 2 1/2 to 3 inches, these specimens capture the delicate architecture of the deep sea, their skeletal remains telling stories of ancient tides and underwater worlds. Whether you're a collector drawn to the mysteries of marine life, a naturalist seeking authentic ocean artifacts, or someone who simply loves the raw elegance of shells and sea treasures, these urchins bring the wonder of the aquatic realm into your home. Each piece is unique, a reminder of the ocean's endless artistry and the quiet majesty found in its smallest wonders.