140lb Premium Cotton Texture： Professional-grade 100% cotton watercolor paper cards (300gsm cold-pressed) for seamless blending. Acid-free & archival-safe, ideal for heavy washes or fine details on blank watercolor cards with envelopes. Complete 4x6 & 5x7 Kit: Contains 50 watercolor cards (foldable from 10"x7" to 5"x7"), 40 watercolor postcards (4"x6"), 50 envelopes (30 white, 20 kraft), and 40 stickers. The value 4-piece set makes each sheet more affordable. Warp-Resistant & Erasable Cotton Paper： 140lb 100% cotton paper resists buckling, with super absorption for even pigment spread. Cold-pressed texture allows high erasability – perfect for layered florals, valentines, or holiday cards. Acid-Free & Archival Safe: Crafted with acid-free watercolor paper cards, this material prevents yellowing and fading over decades. Preserve hand-painted cards as heirlooms or gallery-worthy art. Multi-Occasion Flexibility: Neutral-toned envelopes suit rustic weddings, Christmas, or birthdays. Use 4x6 watercolor postcards for travel journals or frameable art. Professional-Grade Cotton Watercolor Card Kit Crafted with 140lb cold-pressed 100% cotton watercolor paper, these blank watercolor cards with matching envelopes offer archival-quality performance. The super-absorbent texture ensures even pigment blending, while warp-resistant technology keeps paper flat even with heavy washes. The highly erasable surface allows effortless corrections, perfect for beginners creating floral thank-you cards or professionals designing watercolor wedding invitations or Valentine’s Day art. Dual-Size Versatility The kit includes: 50 foldable blank Watercolor cards: Pre-scored 10"x7" sheets fold into 5"x7" cards, ideal for holiday greetings or birthday invitations; 40 rigid 4"x6" Watercolor postcards: Mail as hand-painted travel postcards or frame as mini gallery art; 50 dual-tone envelopes (30 white + 20 kraft) & 40 sealing stickers to complement rustic or modern styles. Archival Durability & Gift-Ready Packaging Acid-free & pH-neutral: Preserve artwork for decades without yellowing, perfect for heirloom anniversary cards or collectible postcards; Luxury magnetic-closure box: Shockproof foam inserts protect cards, making it a thoughtful gift for artists or DIY enthusiasts. Why Choose This Kit? Cotton Paper Superiority: 140lb weight + cold-pressed texture balances pigment control and detail retention, outperforming wood-pulp alternatives; Multi-Occasion Mastery: Create Mother’s Day watercolor cards, corporate thank-you notes, or seasonal crafts with one versatile set