WS2811 Addressable Pixel LEDs, 5V, Waterproof

Selling strings of 50 addressable, waterproof LEDs. Almost all were used for only 25 days, 8 hours per day, for Christmas lighting as shown in the photo. Everything is in like-new condition. I am selling them simply because I need to replace them with 12V or 24V models to enable more professional use, due to cable length requirements. €20 per string of 50 LEDs, including shipping. €15 for pickup. Best price for quantities over one. Happy to answer any questions :)