Comparison : Item # 3003 H14 Half Hard 0.0120" x 12" x 12",
Item # 3003 H14 Half Hard 0.0120" x 12" x 18",
Item # 3003 H14 Half Hard 0.0120" x 12" x 24",
Item # 3003 H14 Half Hard 0.0120" x 24" x 24",
Item # 3003 H14 Half Hard 0.0120" x 24" x 36",