Quality Park Redi-Seal Health Insurance Claim Envelopes, Size 10 1/2 (4 1/2in x 9 1/2in), Box Of 500

Specially designed for use with Insurance Form CMS-1500 Redi-Seal closure requires no moisture to seal. Simply raise the lower flap and press to seal. Security-tinted inside for privacy and confidentiality. Made of crisp 24-lb white wove for a substantial feel.