SINBEE Mermaid Birthday Decoration – 40-Inch Mermaid Foil Number Balloons for Under-the-Sea Parties

Enchanting mermaid party decor

Transform any venue into an under-the-sea celebration with the SINBEE Mermaid Birthday Decoration set. Crafted from durable mylar foil, the balloons boast vivid colors, crisp print, and a premium feel that elevates photo moments and party vibes alike. The collection centers a dramatic 40-inch numbered balloon paired with mermaid-tail and shell accents, creating a cohesive, whimsical focal point for girls’ mermaid-themed events, baby showers, or weekend celebrations.

What you get is more than balloons—it's a small, self-contained decor kit designed to spark imagination. The kit balances bold statements with graceful details, making it easy to create a memorable scene whether you’re hosting indoors or decorating an outdoor terrace.

What’s included

• 1 x 40-inch number balloon
• 1 x mermaid tail balloon
• 2 x 18-inch round mermaid balloons
• 2 x 21-inch shell balloons
• 1 roll of balloon string
• 1 straw for easy inflation

Materials, design, and care

These balloons are made from non-toxic, durable mylar foil with bright, long-lasting colors and clear printing. The unique mermaid tail and shell motifs add a gentle, fantastical touch that works well for indoor displays or photo-worthy backdrops. The set is designed for light to moderate use and can be reused with careful handling.

The design encourages quick assembly: the top holes make hanging straightforward, and the included string keeps all pieces aligned for a clean look. If the foil layers ever stick together while inflating, pause and separate them before continuing to avoid damage.

How to set up

• Find the self-sealing valve on each balloon and choose your inflation method (air pump or straw).
• Inflate slowly, aiming to fill about 80% to maintain shape and control.
• If foil layers stick, stop and gently separate, then resume inflating to prevent tearing.
• To deflate for reuse, insert the straw and release air gradually; store flat for next use.
• Use the top holes to thread the included ribbon and hang the display as a backdrop or arch.

Perfect for many occasions

Mermaid balloons pair beautifully with mermaid-themed birthdays, under-the-sea parties, ocean-themed events, baby showers, and gender reveal celebrations. They also make a charming accent for kids’ rooms or creative home office decor, bringing a touch of whimsy without overwhelming the space.

Display ideas include a dramatic doorway arch, a photo wall behind the dessert table, or a standing centerpiece with additional garlands. The bold 40-inch number balloon serves as a strong anchor for your party scene and can be reused in future celebrations to keep the magic alive.