Assertion: electronic blasting cap | /r/MadeOf | balsa wood
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text: 5 a insert for a conventional non-electronic blasting cap made of a soft, pliable, shock absorbing material such as polyethylene foam or soft wood such as pine or balsa wood approximately 5.25 inches long and 0.7 inches in diameter having an opening therein to accommodate a conventional non-electronic blasting cap is illustrated.