what is this toy called???

[myermay]

My ds went to someones house the other day and said he made a big house/shelter out of large foam tubes (like swimming woggles), but with magnetic metal bits at the end. Bit of a longshot but does anyone have any idea what they are called please?? would like to order some for christmas

[tortoise]

was it this?

[myermay]

that sort of thing but all blue rods apparently. Thank you