Although the pieces connect well with other brands of marble walkways, the pieces included in this supplement do not connect well together. In particular, the ends of flexible hoses do not fit well into spherical plastic parts. If you push them too far, they block the balls. If you don't push them deep enough, they will come out. In addition, the ends of the tubes must be slightly gathered into a bundle for insertion; When this bundle is down, it blocks the marble. Not a reliable set.
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