Motorised GBC Harp Track Marble Run

Presenting the first marble run with a customisable track — where creativity meets engineering.

The Harp Strings Marble Run features adjustable tension cords that let you reshape the marble descent path to your liking, creating a dynamic, ever-changing downhill experience.

Equipped with a powerful PRO Series electric motor, this model powers both the ball feeding system and the climbing mechanism, enabling a continuous loop of movement from start to finish. After completing the course, marbles are collected in a return box and sent back up automatically.

Designed for hands-on interaction and endless motion, this build is as satisfying to watch as it is to assemble.

24builds® offers tracked & insured worldwide delivery for €9.99 per order through premium couriers such as FedEx, UPS, DHL and more.

Orders to EU/EEA, USA, Canada, Australia & New Zealand are all shipped within 5-10 working days.

Please note that in order for us to minimise delivery time and shipping costs, we replace any original boxes of the product with a smaller, more ergonomic and more secure packaging option.

Order cancellations
You’ll be able to cancel your order during the first 24 hours since purchased, and if hasn't entered transit.

Returns
Unopened merchandise may be returned for a full refund within 30 days of receipt of your order.

More info
Please see our Shipping Information page for more detailed shipping times by region.