The gelatinous to rubbery consistency lends texture to soups. Actually, many are somewhat rubbery and gelatinous. When they are overcooked, they have a tough and rubbery texture. They are generally soft, sometimes rubbery. They can become infested with maggots and become firm, rubbery and inedible as they mature. They have black aluminium cases and soft rubbery key surfaces with no moving parts. Thermoplastic elastomers show advantages typical of both rubbery materials and plastic materials. Atactic polypropylene is an amorphous rubbery material. HTV is typically smooth to the touch and does not feel rubbery or stiff. They have thick, rubbery lips and powerful jaws. The rubbery, vinegary-smelling silicone caulks, adhesives, and aquarium sealants are also well-known. Above "T", molecular motions are activated and polymers are rubbery and viscous. It cannot be crumbled and has a more rubbery texture. The bladder layer is a rubbery, airtight layer much like a balloon. Prolonged exposure to the pickling solution may result in a rubbery texture.