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Product Description For kids who think outside the box! These curved blocks are perfect for building tunnels, bridges, or the Loch Ness monster. Set of birch blocks comes with four different widths. For use both in the classroom or at home. From the Manufacturer Create a world of tunnels and arches with this 10-piece wooden set from ECR4Kids. Curved, hardwood blocks in three different widths and diameters for use as a fun, building manipulative or as "tunnels" for use with other small toys. For use both in the classroom or at home.