Kord and Anderson brands are the best value in reusable pots. All sizes have thick almost crush-proof, dark green walls, with a smooth finish to keep soil from sticking when plants are being removed for transplanting. Pots have drainage holes, wide bases for stability, a rim band for extra strength and ease of handling. 25 minimum. The Kord 4 Pot is 4-1/2" sq x 4" deep. A full case is 510 pots.