1.Tamping is one of the most important factors to brewing the perfect shot. The ground espresso needs to be densely compacted into the portafilter in order for the hot water to be uniformly forced through the grounds with the same pressure through out the entire portafilter. 2.The tamper features two base tamping sides (2 Angled Slopes and Flat Base). 3.Food grade Solid Heavy duty uncoated 304 stainless steel, Dishwasher Safe, Rust-proof. Item: Coffee Tamper Colour:Black+silver Material:Stainless steel + aluminum alloy Size:53.3mm Package Contents: 1 x coffee tamper 1 x base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.