The discussion focuses on the compression of piezoelectric crystals, specifically PZT, under maximum force. Users seek to understand the typical force these crystals can withstand and the corresponding compression in centimeters. One participant notes that applying around 100N of force generates 4-5V from a 4cm² piezo crystal but is unclear about the exact distance of compression. The conversation highlights the need for specific data on compression limits for various sizes of piezoelectric crystals. Overall, the inquiry emphasizes the relationship between applied force and the resulting compression in piezoelectric materials.