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These are manual suction nipple pumps from XR Brands' Size Matters line. A squeeze bulb draws a mild vacuum that pulls the nipple into a clear chamber, and the toy holds itself in place once you let go. The clear cylinder lets you watch the nipple enlarge as suction builds. They suit people exploring nipple play or sensitivity play who want a simple, hands-free-holding manual pump rather than a battery-powered twist-style cylinder.
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The Size Matters See-Thru Nipple Boosters are nipple toys that use gentle suction to enlarge and stimulate the nipples. Suction and increased blood flow can increase sensitivity and improve circulation.
To use them, place a booster over the nipple and squeeze the bulb to create a mild vacuum. Once released, the booster stays in place on its own. The chamber is see-through, so you can watch as you play.
