ARTISTRO 水彩ポストカード 30枚 4x6インチ - 厚手ペーパーカード 140lb（300gsm） - 郵送用ブランクポストカード、DIY感謝カード、グリーティングカード、クリスマス、招待状、誕生日などに

The address field side is a nice touch, so I can paint a little scene and actually mail it to my sister without an envelope. Paper held up to a wet wash without warping, and 30 cards is plenty for a weekend project.

The address field on the back is perfectly sized and spaced, so my finished paintings went straight into the mailbox without needing envelopes. Every single card stayed flat after two layers of wet washes, and the 4x6 format is just right for a quick thank-you note.

The paper weight is perfect—my paint didn't buckle at all, and the blank side took washes beautifully without bleeding through. The 4x6 size is ideal for quick studies, and I've already mailed a few with the address field on the back without any issues.