Elong nip-suckers are designed to draw out and temporarily enlarge nipples with powerful suction. This increases sensitivity and makes nipple play more pleasureable. To apply, simply wet the bottom of each sucker, squeeze out the air, and place around the nipple. Elong nipple suckers are made with Oxballs proprietary flexTPR™, a soft rubbery material that allows them to provide suction without pinching. They can be used with water-based, hybrid, or silicone lubes. Oil-base lubes are not recommended.