These are Vintage 1950s-1970s Rhenium Flashbulbs. Two boxes of different sizes bulbs. One box has 4 M3B Bulbs and the other box has 10 AG3B Bulbs. Both of them are GE products which means the BEST ! These type of bulbs were known for their reliability using rhenium wire to ignite a magnesium or zirconium filled bulb. These bulbs are known for providing a bright instant flash for cameras. By using Rhenium it increases their durability making them highly reliable even decades later but of course I just cant give any guarantees
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