A slide or bottle neck is great for playing blues and Hawaian style slide . The slide is placed against the strings of to vary it's vibrating length. Available in glass, brass or steel Each shell is hand selected and quality inspected to ensure shell integrity. Hermit crabs need intact shells that can hold some water to keep the crabs' gills moist. You may not get the exact shells in the picture, the shell types you will receive will be based on availability in your size selection, however, rest assured you will receive hand-picked and quality inspected shells (known to be used by hermit crabs) similar to the types in the listing picture. It's recommended to provide a variety of shell sizes within your hermit crab's size range to choose from, so consider ordering multiple size ranges. To find the correct size shell for your hermit crab, please refer to the HOW WE MEASURE picture in this listing. After receiving your hermit crab shells, we recommend boiling them for 10 minutes in primed (de-chlorinated) water with aquarium salt (optional). Extra Large Hermt Crab Turbo Shells - Etsy Hermit Crab Cage 4 Shell Hermit Crab Set Assorted For Medium To Large Hermit Crab Boil Assorted Hermit Crab Shells with Abalone 2-4 Case Pack 4 Measure across the longest diameter of the shell opening using a ruler or tape measure for accurate sizing. It's a good idea to sterilize empty shells in your tank every few months. 35 Shell Hermt Crab Set Assorted for Small Hermt Crabs (1/4-1 1/4... NEVER use bleach as it is toxic to hermit crabs. After boiling the hermit crab shells, allow them to cool before offering them to your hermit crabs. We have many different shells in stock and no two are identical.