The Short Bore Extender Protector is a simple yet innovative way to keep the short guns safely on the rack or in a gun safe, preventing them from sliding off or leaning onto other firearms. They are easy to trim and use the pieces in a variety of lengths and in different caliber bores. Great as a safety device keeping rust causing dust or debris out of your bore. Made of flexible yet strong bright yellow plastic nylon, measuring 10″ in length.