Tamping needs to be exact, each time. That is what this company believes in, and that is why they designed this product.The new features of the Q2 are: Nano non-stick tamp head reduces coffee build up. Newadvanced stiffer frame provides even better consistency. New easy adjustment wheel makes setup easier. Using bottomless? Now works perfectly with bottomless porta-filters. Simply place your portafilter in and the tamper is automatically activated giving you the perfect, even tamp in 1.3 seconds, time and time again!Specifications Weight: 9 lbs. UL Approved Tamper Shape: Flat Base 58mm (ask for other sizes) Adjustable Pressure: 22-66 lbs Adjustable height for different size portafilters Dispense Time: 1.3 seconds Clean Mode 2 year / Unlimited Tamps Warranty More than 10 kg of coffee per week Can I change the tamper of my PUQpress for another diameter after purchasing it? Yes you can, it only takes 30 seconds.If you want to change a tamper smaller than 56mm to a tamper larger than 56mm or vice versa, your upper clamp needs to be changed as well. In that case please contact us for support.