Mini 4WD Product Mini 4WD Washboard Section (5mm,10mm/2pcs. Each) Item No:69572 This set contains 2 each of ①H:5mm, W:49mm, L:120mm & ②H:10mm, W:55mm, L:120mm. ★Add these sections to your track for an extra challenge!!! Information is correct as of March 4, 2015. Specifications are subject to change without notice.