SKS offers 20 mm size S105 FS 3-19 foil heat induction liners in bulk, not pre-placed in caps. These liners are structured to seal PET or PVC containers once placed inside compatible 20 mm caps and activated by an induction sealing machine. Induction liners create a tamper evident, airtight seal, while also maintaining product freshness; when customers are ready to use the contents sealed inside, these induction liners peel off cleanly.