This Reversible Bottom Board by Betterbee offers flexibility for your 10-frame hive setup, featuring a dual-sided design with 1/2" and 3/4" entrances to adjust airflow and manage hive access. Crafted from durable Eastern White Pine and fully assembled with rabbeted crosspieces, it effectively minimizes moisture inside. The board includes a wooden entrance reducer, ensuring bees have a controlled entry. Measuring 22" L x 16-1/4" W x 2" H, this quality-built board is ideal for a stable, well-ventilated hive foundation.