This set of loop attachments comes with hook-and-loop fastener that allow them to attach to the wall strips. Use to create longer marble runs. Ball runs are a fascinating way for children to have fun building and experimenting. Ball Run Peg Board is easy to assemble at any time to create new challenges, and helps children learn about the laws of physics through play. By trying different things, they learn about slopes, distance, speed, gravity and weight and how they all work together. Made of nylon polyester in a gray/green color. 10″L x 3″W. Set of 20 Five year warranty Made in Germany. Ball/Marble Run Components (Sold Separately): 208286- 4 Wall Strips 208283- 20 Loop Attachments 208407- 8 Plastic Tubes 208314- 6 Straight Connectors 208097- 3 Y-Shaped Connectors 351317- Wooden Ball Mix 6-Piece Set (red & blue) – 1.5″2″ *** HABA is custom produced, no cancelationsor modifications allowed.Lead time is 12-14 weeks.