Two levels of difficulty make these pattern block cards perfect for the beginning or intermediate student. Level 1 has lines and shape colors shown. Level 2 has interior and exterior lines only. Ideal for matching skill practice and fitting shapes together! Includes 20 durable, double-sided 81‚ÅÑ4" x 112‚ÅÑ3" cards in a resealable plastic bag. Pattern Blocks sold separately.