BeeCastle 20 Pack Medium Beehive Frames and Waxed Foundations, Honey Bee Frames with Wooden Bee Hive Frames and Beeswax Coated Foundations, 6-1/4-Inch (Yellow). 20-Pack Honey Bee Frame: The bee frames have 20pcs bee hive frames and wax foundations for Medium Super Box. Fits to Standard Langstroth Beehive Medium Super Bee Box. Beeswax Coated: The foundations of medium beehive frames are dipped in beeswax, which makes beehive foundations more acceptable to bees and helps bees to build honey comb quickly. Safe Material: The foundations of medium bee hive frames were made of food-grade plastic, which is safe for bees. The yellow color also helps to inspect honey. The wooden frames of the bee hive frames are pine wood. Easy to Assemble: Comes with 20pcs beeswax coated foundations, 20pcs wooden frames(including 40 Sidebars, 20 Top bars, 20 Bottom bars) and nails for assembly. You can also use wood glue to add stability. Standard Size: Medium Beehive Frames(6-1/4 x 19 x 1-3/8). Be Used to swap during harvesting or replace broken frames for Langstroth Medium Super Beehive Box. FSC-Certified: The beehive frame is made of FSC-Certified wood.