Is this magnetic enough to use on an old style 'ribbed' radiator? Thanks

I guess, it is pretty strong. Depends on radiator and its surface and material. Not all radiators are suitable for magnets use. I got one to none of the magnets sticks for some reason.

What size whiteboard is suitable for the runs please?

That's a tricky question to answer because you can build the marble run spread out wide or zig-zagging in a narrow set up. But the longest pieces (the straight pieces) are 25cm long, if that helps. We use our Tumble Trax run on the side of our average sized fridge-freezer which is good enough but the more space you have, the more building options you have! We aren't able to build all the suggestions on the work cards because our fridge wouldn't be wide enough but we can build a tall run with longer drops. I'd imagine, in a space much smaller than a fridge surface, you maybe wouldn't have space to use all the pieces all the time.

Any idea what size marbles suitable for this? I see Amazon do a pot of 16mm size but not sure if these are too small or too big.

Hi, I can confirm that there are 4 marbles provided with the product. But if you did want to add extra marbles in they measure 17-18mm in diameter. If you have any further questions, please let us know.

Product Dimensions	32.39 x 26.04 x 6.99 cm; 22.68 g
Manufacturer recommended age	6 - 10 years
Item model number	LER2821
Educational Objective(s)	Critical Thinking
Language:	English
Number of pieces	28
Assembly Required	Yes
Batteries Required?	No
Batteries included?	No
tech_spec_battery_description_toys	No batteries required
Material Type(s)	MAGNET SET
Remote Control Included?	No
Colour	Multicoloured
ASIN	B00S2XPFVQ

Tumble Trax Magnetic Marble Run

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