This poly propylene trap will last for years and easily hold its shape between seasons. Made in the USA. Propolis traps are an excellent way to harvest clean propolis from your hive and add extra income. Replace your inner cover with our plastic propolis trap. The bees will fill the grooves of the trap with propolis. To remove simply put the trap inside a plastic bag and freeze overnight. Twist or bang the trap inside the bag against a flat surface to release the propolis.