☕ Material - This coffee knock box is made of ABS. The knock bar is made of durable rubber. The surface is smooth and the bottom is matched with a non-slip base, effectively prevent the box from slipping. ☕ Noise Absorbent Rubber Bar - The removable rubber bar can effectively improve the splash coffee powder, reduce the noise during use. ☕ Size - The bottom diameter: around 105mm(4.1inch); Height: 103mm(4.1inch); Opening width: is around 110mm(4.4inch). It's ideal for most kinds of coffee makers and espresso machines. Its compact size could save your space. ☕ Easy to Clean - The removable coffee bar makes it easy to clean. ☕ Mutli Use - Despite the daily use at home kitchen, the knock box can be used in cafe shop and bar. You can take it on for camping as well.