5x5cm Flexi iSTIM 16x3.5mm Stud (snap/button type) TENS self-adhesive pads fit with BEURER, SANITAS and VIRTUALLY all TENS massage machines on Amazon.

Med-Fit Self-Adhesive Pads - Universal Studded Electrode Pads to Fit Virtually All TENS Machines - Target Small or Large Painful Areas - 16 Pack. Stud Size 3.5mm

Beurer EM49 PainFree Digital TENS and EMS Machine | Drug-free natural pain relief | 3-in-1 pain relief, rehabilitation and massage | 70 training programmes | 2 channels | 4 self-adhesive electrodes

Tens Electrode Pads 5x5cm Self-Adhesive Electrodes With 3.5mm Stud Connection (16 pcs) Compatible With Beurer, Sanitas, Boots, Kinetik Tens Machines