Adams 1099 Envelopes are security-tinted for privacy & sized for a precise fit with 1099 tax forms with two forms per sheet. Durable, gummed closure provides an aggressive seal. Complex security tint conceals the appearance of letters & numbers, even when held to light. Perfectly aligned double windows keep personally identifiable information out of view. Envelopes are designed to fit 1099 MISC, 1099-R, 1099-DIV, 1099-INT & 1098 tax forms.