Size 9x12 9x12 9x12 9x12 10x13 10x13 6x9. Self-Sealing Envelopes: SUNEE's 9x12 Manila envelopes are designed with ultra-strong self-adhesive tape. 9x12 Durable Envelopes: SUNEE catalog envelopes are made of sturdy 28 lb brown kraft paper, featuring a robust self-seal closure.
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