HongXing 500ml Insulated Tumbler 304+316 Steel Straw Cup | Factory Direct

A tumbler that advertises its insulation grade usually puts "304" somewhere visible and calls it finished. The Qingyi 500ml uses a 304+316# dual-steel construction — 316# for the inner wall where the liquid touches, 304# for the outer body where the hand touches — and lets the design do the talking. No text on the cup body. No technical labels. A matte monochrome finish in Yellow, Red, or Green, a clean cylindrical silhouette with a subtle taper at the base, and a transparent flip-lid window that shows the drink without opening.

The 316# inner liner is the material differentiator. Where standard 304# resists most daily beverages, 316# adds molybdenum for higher resistance to acidic drinks — coffee, citrus water, fruit infusions. It is the material specification that premium thermos brands use to justify a higher price point, and it is built into every Qingyi at the 500ml capacity.

The flip-lid mechanism integrates a transparent drinking window and a built-in silicone straw that routes from cup base to mouth. The window shows liquid level without opening; the straw stays attached to the lid assembly — no lost parts, no reassembly. The vacuum double-wall construction maintains hot drinks above 55°C for approximately 4 hours and cold drinks below 12°C for approximately 6 hours under standard ambient conditions.

For wholesale buyers, the Qingyi is the fashion-forward daily tumbler in HongXing's thermal drinkware range — positioned for women's lifestyle retail, boutique gifting, and premium office supply channels where the 316# inner liner and minimalist matte finish differentiate it from the standard 304# competition.