Waterproof PVC Please Knock Stickers

Each sticker measures 12.00 x 10.00 x 0.10 cm (4.72 x 3.93 x 0.04 inches) and is made from durable black PVC material. The stickers feature a strong adhesive backing designed for clean, smooth surfaces including interior doors, walls, and windows. Fully waterproof construction ensures long-lasting legibility in humid or high-traffic areas such as bathrooms, shared flats, or office entrances. The clear 'Please Knock Before Entering' message supports respectful privacy boundaries in homes, student accommodations, and professional environments.