Borosilicate glass, often referred to as hard glass, is produced using silica combined with boron trioxide. This composition makes it far more resistant to sudden temperature changes than standard glass. In addition to its strength, borosilicate glass is also lighter, which makes it suitable for a wide range of applications. It is the material of choice for most modern laboratory equipment and is widely used in medical tools thanks to its excellent chemical and thermal stability. These same properties make glass toys a safe option for internal use when paired with lubricant, while also offering a uniquely smooth and enjoyable experience.