Penn Plax HC25 Hermit Crab Starter Kit Plusrter Kit Plus PERFECT FOR THE BEGINNER: this kit is a great start for the new Hermit Crab owner KIT FEATURES MANY PRODUCTS: kit contains sponge, gravel, climbing grid, natural branch, and full color background. 1 GALLON TANK INCLUDED: the 1 gallon tank measures 10L x 6W x 7H, with a small slit ventilated cover, flip-top opening section, and handle.