These stickers measure 2.5" x 2.5"
 
From the manufacturer:
 
"These custom-print waterproof stickers are oil-resistant and dishwasher-safe. They're perfect for bottles, jars, and packaging - even in moisture-heavy environments, whether it's outdoors or inside. Our waterproof vinyl stickers are high-quality and coated with a durable protective laminate that makes them water-resistant and resistant to fading, scratching, or tearing."