These Science Birthday Invitations are crafted with high-quality, heavy matte card stock that ensures a professional and elegant look. Each invitation card is double-sided and comes with bold, vibrant colors that will make your event stand out. The 4" x 6" size is ideal for clear handwriting and customization, making it perfect for boys or girls who love science. The set includes 20 invitations and 20 matching envelopes, giving you everything you need to host a memorable Mad Science Party.","Ideal for creating a unique and exciting atmosphere at any science-themed celebration, these invitations are perfect for boys or girls who want to invite friends and family to a fun and educational party. The easy fill-in format lets you personalize each card quickly, while the durable card stock ensures your invitations stay clean and legible. Whether it's a science fair, a mad science day, or a cool science party, these invitations will impress your guests and make your event unforgettable.