What size marbles does it take?

You should only use Gravitax balls that come in the sets. The track is configured so that the marbles fit through the curves and rails, and only GraviTrax balls must be used. It is worth knowing that across the range there are two different ball sizes; The balls that roll down the track and the slightly larger ones that are used as weights on the Catapult, for example. Do not use the weight-balls to roll down the track, as these are slightly larger and can get stuck in your track. The ball are not sold seperately but 26979 Gravitrax balls and spinner extension contains 6 balls.

Is this compatible with the XXL set?

Yeah all the expansions go on the xxl set

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Description

⚡ Elevate playtime with the marble run that’s as smart as you are!

BUILD BEYOND LIMITS - Start with 9 precision pieces and expand infinitely with a vast range of add-ons for endless creativity.
STEM SKILLS IN ACTION - Boost spatial reasoning, planning, and critical thinking through hands-on, stealth learning play.
INSTANT FUN ZERO HASSLE - Clear, easy-to-follow instructions get you building and racing marbles in minutes—no batteries required.
MASTER GRAVITY MAGNETISM - Harness real-world physics to create mesmerizing marble runs that defy expectations.
THE ULTIMATE GIFT FOR CURIOUS MINDS - Perfect for kids 8+, this eye-catching set sparks imagination and engineering passion.

GraviTrax Transfer is a cutting-edge marble run construction toy designed for kids 8 and up, combining STEM learning with creative play. Featuring 9 precision pieces, it leverages gravity and magnetism to create dynamic tracks that can be endlessly expanded. With clear instructions and no batteries needed, it’s the perfect gift to inspire spatial reasoning and engineering skills.

Specifications

Product Dimensions	19 x 19 x 4.8 cm; 109 g
Batteries	1 A batteries required.
Manufacturer recommended age	8 years and up
Item model number	26158
Educational Objective(s)	Promotion of STEM skills and imagination through hands-on construction experimentation with gravity-powered marble runs.
Language:	Dutch, English, French, German
Number of Game Players	1+
Number of pieces	9
Assembly Required	No
Batteries Required?	No
Batteries included?	No
tech_spec_battery_description_toys	1 alkaline battery
Material Type(s)	card
Material Composition	Metal & Plastic
Remote Control Included?	No
Colour	No Colour
Release date	1 Mar. 2020
ASIN	B082QCFBLD

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