# Building toys that teach gears, magnets, or simple machines Which building toys teach how gears, magnets, or simple machines work? Klutz DIY Rainbow Catcher: Maker Lab STEM Kit: The kit builds into a motorized machine using gears and electronic components to make rainbows move around the room\. Yookidoo Tumble Ball Stacker: The side gears can turn alone or interact with one another\. Tegu Magnetic Racer Building Block Set: Compatible with all other Tegu Magnetic Wooden Blocks\. ### 1. [Klutz DIY Rainbow Catcher: Maker Lab STEM Kit](/products/ucp/anbbaby-com/4990543364182) (sold by anbbaby\.com) The kit builds into a motorized machine using gears and electronic components to make rainbows move around the room\. - Gears: - - Magnets: - - Age range: The store lists a narrower recommended age of 8–12 years, while the maker says ages 8 and up\. (guide) - Included parts: The kit includes three clear crystals, three silver rings, two suction cups, three holographic plastic pieces, a wired motor, a battery box with alligator clips and a plastic gearbox\. (guide) ### 2. [Yookidoo Tumble Ball Stacker](/products/ucp/anbbaby-com/9032239022366) (sold by anbbaby\.com) The side gears can turn alone or interact with one another\. - Gears: The side gears can turn alone or interact with one another\. (guide) - Magnets: - - Age range: The sources disagree on age: the maker says 9–24 months, while the store feed says 1 year and older\. (guide) - Included parts: The maker’s contents section lists one stacker base, one funnel head, three stackers and three rattling balls\. (guide) ### 3. [Tegu Magnetic Racer Building Block Set](/products/ucp/anbbaby-com/6598345326678) (sold by anbbaby\.com) Compatible with all other Tegu Magnetic Wooden Blocks\. - Gears: - - Magnets: Compatible with all other Tegu Magnetic Wooden Blocks\. (listing) - Age range: Designed for children from 12 months to 3 years\. (listing) - Included parts: Includes a chassis, body and driver\. (listing) ## Also cited in the text - Klutz DIY Rainbow Catcher: Maker Lab STEM Kit, operation: The kit builds into a motorized machine using gears and electronic components to make rainbows move around the room\. (guide) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-26T02:39:44.124Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)