Troyer Purple Martin Horizontal Tunnel Conley Gourd. Crafted in the Usa. Excellent housing for Purple Martins, PMCA approved! Biologist endorsed! Amish made in USA. One gourd per pack. Heavy duty twist-off cap for nest checks and cleaning. Horizontal design helps prevent predators. All purchases support scientific research of Purple Martins. One-piece, 9 x 14" opaque, top quality, high-density polyethylene plastic.