The weight bags supplement the baric tablets on the sensorial shelf by further refining the child’s tactile sense of weight. The materials consist of five pairs of small bags, with each pair weighing the same, while the five pairs have different weights. The bags weigh 20 grams, 60 grams, 100 grams, 140 grams, and 180 grams. The control of error in the work is that each bag has a pair and if two bags are incorrectly matched the last two bags will not match, requiring the work to be revisited. The bags have metal rings at the top of silver and gold allowing the child to hook a finger into the ring as a method of weighing them.

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