When evaluating a tea rolling machine, focus on the rolling barrel diameter (typically ranging from 25cm to 110cm) and load capacity, as these determine your production throughput. Ensure the machine features food-grade stainless steel (SUS304) for all parts in contact with tea leaves to prevent contamination. Additionally, check the motor power and speed adjustability; a variable speed control allows for processing different tea types (e.g., green vs. black tea) which require different rolling intensities to achieve the desired cell breakage rate (usually 80%+) without damaging the leaves.