New CMS 1500 - HCFA Insurance Claim Forms and Self-Seal No. 10-1/2 Tinted Window Envelopes - 100 FORMS AND ENVELOPES New CMS 1500 - HCFA Insurance Claim Forms and Self-Seal No. 10-1/2 Window Envelopes Size: No. 10-1/2, 4.5 x 9.5 inches White with Inside Security Tint Press and Stick Envelopes, Easy to Seal Package of 100 Forms and Envelopes