Fellow Espresso Guided Tamper The Fellow Espresso Guided Tamper is a spring-loaded, pressure regulating tamper designed for use with 58mm portafilter. Inside the handle, the spring helps you execute controlled pressure tamps while a painted volumetric guide on the outer ring of the tamper gives you visual feedback to ensure consistency between tamps. Made of two pieces, an aluminum handle and a stainless steel base, this tamper is designed to simplify espresso prep while sporting a tasteful modern look that pairs nicely with any espresso machine, especially the Fellow Espresso Series 1. Fits 58mm Portafilters