Pentagon coaster (set of 2)Pentagon coaster (set of 2) Pentagonal wooden coasters are a popular short term teaching material. The pentagonal coaster is an auspicious shape, and the word 'pass coaster' sounds similar to this. You can make practical pieces to pray for success in exams. Wood section: approx. 129 x 123 x 10 mm (80 mm on each side) x 2, router cut Cork sheet 60 x 2 mm x 2 Sandpaper x 1 Wood material: Poplar