Balancing Bowls tip when loaded with 100g worth of snack
Royal VKB's "Balancing Bowls" are two-sided melanine snack-bowls that rock from side to side, and are balanced to tip over when one side has precisely 100g (or 250g for the large size) worth of nosh loaded into it, providing a built-in snack-measurement system. They also look great! Link
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