"Insurance Form Envelopes 24-lb. white wove paper with Poly-Klear® right-hand window. Gummed seal, security tint. 500 envelopes per box. #10-1/2 Size For Medicare claim form HCFA-1500. 1 x 4-1/2 window 1-9/16"" from bottom, 4-1/4"" from left. 4-1/2 x 9-1/2"
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