A renewable bullet is a small vibrator meant to live inside something else: a hollow plug, a cock ring pocket, a pair of vibrating underwear. When the motor dies or you want a stronger buzz, you swap the bullet rather than replacing the whole harness.

Diameter has to match the pocket. A sloppy fit rattles. A tight fit never comes out again without pliers. Look for a bullet with a retrieval nub. Smooth capsules look elegant and disappear into a plug forever.

Water ratings get confusing in this setup. The bullet may be splashproof while the plug is boilable. Do not boil the motor. Dry both parts before you nest them again so you do not seal a damp motor in a silicone tomb.

Compatibility

• Measure the cavity, do not guess from photos.
• Keep a spare charged bullet if the pocket toy is part of a planned scene.
• Avoid cheap unsealed bullets in internal pockets.
• Clean the pocket as carefully as the bullet.