Enhance the color of your hermit crab. This all natural and preservative free supplement is high in anthocyanin, which is a natural blue/purple pigment found in foods. Designed for Indo hermit crabs, Blue Ecuadorian crabs, and any other hermit crabs with natural purple/blue coloring. This will also bring out the purple color in the common crab’s (purple pincher’s) pincher. Brand: Fluker’s Assembled Product Dimensions (L x W x H): 2.00 x 2.00 x 3.75 Inches