Prepucio magnético, con rodamientos y pelota de tenis de mesa

• 00:00
• 01:12
• 02:00
• 03:12
• 04:00
• 05:12
• 06:00
• 07:12
• 08:00
• 09:12
• 10:00
• 11:12
• 12:00
• 13:12
• 14:00
• 15:12
• 16:00
• 17:12
• 18:00
• 19:12

20 minutes. First table tennis ball, then fifteen ball bearings inserted. Used a large magnet to see if it would attract the bearings inside, which it did.