This is Rubber Touch Ink from XINWEI.

It offers a soft and delicate rubber-like touch, endowing metals with warm and gentle features. With good processing properties, it is convenient to apply, and is wear-and scratch-resistant. Compared with Rubber Varnish, rubber ink can be flexibly applied on a partial location, which makes it easy to avoid the positions that need stamping, and is more convenient for packaging design and processing. 

When applied to the tincan of tea, it endows the cans with a silky-soft and warm touch, showcasing the product's high-end style.