Zebra Makkiakea Permanent Marker
The Zebra マッキーケア ultra-fine black marker is a perfect product. At less than 50 cents, it’s available in every convenience store in Japan. It writes on paper, glass, and most importantly, film canisters. It features two perfectly spaced tip sizes: 0.7mm for general signage and 0.3mm for fine details.
I can’t think of anything it could do better. It’s perfect in both design and availability.