This glass anal plug is ideal for both men and women looking for a quality anal toy. The plug is made of glass and has a diameter of 3.9 cm. The glass is smooth and safe to use with any type of anal lubricant. After use, the anal plug can be easily cleaned with water and toy cleaner. You can also heat or cool the glass by placing the plug in warm or cold water for a few minutes or holding it under the faucet.