Timemore 1-Cup Crystal Eye Glass Coffee Dripper: Black Metal

Unlike traditional filter cups,The Crystal Eye‘s structure applied the concave overhead principle rather than the convex principle. Meanwhile, the lower side of the overhead area increases, which makes the water running more smoothly

The inner layer of the brewer is divided into two parts. The top section is smooth, without any ribs - the filter stays attached to the wall, which keeps water inside. The lower part is ribbed, the filter is not that close to the wall, which ensures better flow - that protects filter from clogging and coffee from overextracting.