GROSCHE Melbourne French Press Travel Coffee Cups The upper and lower clamps It s easy to The upper and lower clamps will lock your portafilter into place as the automatic tamping takes place with 10 30kg of precise pressure For non coffee drinkers Dishwasher Safe The glass is dishwasher safe and easy to clean and maintain while the bamboo lid and cork base should be hand washed with mild soap The Melbourne French Press features a heat proof borosilicate glass that is completely safe to use without worries of transferring a bad taste and a premium quality spring and filter to make sure that no coffee grounds or tea leaves go into your cup