This stamp set features six sentiments in a whimsically cheerful script, bold enough for the inside or outside of a card. Try stamping one of these on the back of your envelope for an extra touch of personalization. Hero Arts 4x6 clear stamp sets offer the best quality in the market. They are made in the USA from genuine photopolymer, which is non-toxic, biodegradable, and designed specifically to transfer ink to paper for a true impression every time. Peel the stamp from its backing and stick to an acrylic block for easy positioning. Mix and match the designs, then clean with water or stamp cleaner.