How we keep our catalog current

You are about to spend fifty dollars on two hundred glasses. Before you do, you deserve to know how old the price on the page is, and what happens when that figure moves. This page answers both questions plainly. We write it the same way we write the rest of the catalog: direct, and with the numbers you can act on.

The date of the last update is printed on this page and nowhere else on the site, because a date repeated under every price stops being read. Prices, piece counts and ratings are all refreshed on a schedule. When a number changes, we change it here first. The date you see is the date we last touched the figures, not a promise that nothing has moved since.

When the catalog was last updated

The catalog was last updated on 20 August 2026. Every price, rating and rating count on this site comes from that update, and this page is the only place the date is printed. Prices move, and the figure at the register is the one that counts: if the two ever disagree, the register is right.

What we update and how often

Prices, piece counts, and ratings are refreshed on a schedule. We do not wait for a change to be big before we record it. A price that moves by a dime goes in the same update as one that moves by ten dollars. If the figure at the register ever disagrees with the figure on this page, the one at the register is the one that counts. We update our figures, and we say so plainly.

What we leave off a page

A figure that is not printed on the pack does not go on the page. We do not estimate weights, steel grades, drying times, or gram counts. If the pack does not say it, we do not write it. That keeps the catalog honest in the places where it would be easiest to guess, and it means the numbers you see are numbers someone could hold in their hand.

Getting a correction in

If you spot a figure that looks wrong, write to us and tell us which pack and which number. A wrong price and a wrong piece count matter most, because those are the numbers people act on. Include what you see on the pack itself if you can. The correction goes into the next update, and the date on this page moves with it.

What we do about a pack that goes quiet

A pack we cannot price in the current update does not appear on the front page at all, and it comes back on its own the next time it is available. That is why the fifty on the front page are always fifty packs you can actually buy today, and why the shelf counts move a little between updates.

Where the ratings come from

Ratings and rating counts are read from the product pages, and they are counted once per product family. A pack sold in six colors shares one pool of ratings between those six, so adding the six together would multiply the same people by six. Across CHENGU items that honest count is 58,090 ratings at an average of 4.41 out of 5.

Sources

Sources we read

Every source below was opened and read on the date shown beside it.

U.S. Consumer Product Safety Commission, Small Parts Ban and Choking Hazard Labeling (read 20 August 2026). Which items count as a small part, the cylinder that decides it, and where the choking-hazard warning is required.
U.S. Consumer Product Safety Commission, Art Materials (read 20 August 2026). The art-materials labeling law, the ASTM D-4236 conformance line, and the 90 ppm lead limit in paint.
U.S. Food and Drug Administration, Understanding How the FDA Regulates Substances that Come into Contact with Food (read 20 August 2026). What "food contact" means in law, and the migration assessment behind a food-safe plastic.
U.S. Food and Drug Administration, Bisphenol A (BPA): Use in Food Contact Application (read 20 August 2026). What BPA is used for, and which food-contact uses the FDA has removed from its regulations.
National Institute on Alcohol Abuse and Alcoholism, What Is A Standard Drink? (read 20 August 2026). The 14 grams of pure alcohol behind a shot, a glass of wine and a can of beer.
USDA Food Safety and Inspection Service, Danger Zone (40°F - 140°F) (read 20 August 2026). The two-hour rule for a buffet table, and the one-hour rule when it is over 90°F outside.

If something here is wrong

Write to hello@chengu.org. A wrong price or a wrong piece count is the error we most want to hear about, because it is the number people act on. It gets fixed on the next update. CHENGU packs is the front page if you want to start again.