Florescent orange-colored glass scent holders filled with sheep’s wool and tight sealing metal caps. Your big game lure odors will escape and flatten out if you use plastic 35mm film canisters or plastic scent holders. Use what I use – glass and metal. They are far superior to plastic, keeps lure odors strong and effective and no odor escapes that causes weakening of your scent due to air. Hanger wire attached.