The number 25 is made of glass. Clear, perfect glass. There is no texture other than the obvious shape of the plug. Being Pyrex, it will break into large chunks rather than small shards if you manage to break it. It would be rather difficult, though.
Glass is non-porous and easy to care for. It can also retain temperature very well, so you can experiment with temperature play. Dip it in some cold water or warm water for different sensations. Just be sure to test the temperature on the inside of your wrist so you are sure not to burn or freeze your parts.
This plug has a pretty standard shape. It is a total of 3.75 inches long, and the bulbed head is 2.5 inches long. It boasts an almost 1 inch neck that helps keep it in place with a total insertable length of 3.25 inches. The head is tapered, but at its widest point it is 5.5 inches around. This is a 1.5 inch diameter and is pretty large for those that are not used to anal play. Take precautions, lube, and prep time when playing with this toy as not to hurt yourself if you are a beginner.
This plug works well for its intended purpose, but it is a little bit large for the anal beginner. You will want to take time and prep using fingers, smaller toys, and lots of lube before hand. Remember that glass always feels larger than what it actually is because of the hard nature of the material. It has no give at all. If you feel pain, stop.
Once it is in, it is very comfortable for both long term wear as well as during intercourse. It does stay in place quite well, and the base is such that it doesn't chafe or cause pain.
Glass is easy to care for. It can be cleaned a number of ways: soap and water, 10% bleach solution, your favorite toy cleaner, or boil it. You can also throw it on the top rack of the dishwasher (sans soap) if you wish.
The Icicles line never comes with any type of pouch, so you can either make one or use a sock to keep it from clanging about in your toy box. The packaging is far too large in comparison to the toy itself to keep for storage. You could cut it in half and still have too much.