Endurance Jumper Cable Clamps Link Chain. Light weight rubber-tipped jumper cable clamp style nipple clamps. Their small surface area gives them some real pinch. Endurance nipple clamps offer maximum pressure, for an intense and localized experience. These endurance clamps feature a sturdy, durable link chain. Nipple clamps and link chain provide a classic fetish look. Non-piercing nipple clamps with jumper cable ends tipped in black rubber for comfort. Spartacus A Passion for Quality Catalog page 11.