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To sole this problems firstly, we can change the material of the string to maybe something with less friction thus, it won't get tangled up as much.
And next in order not to injure someone so badly we can maybe change the material of the yoyo to something less hard. Thus, not injuring someone too badly, and also give customers more choices for yoyo's.

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Secondly, I think what made this successful is the convenience of the toy. It brings one great joy when playing it, but the best part of the toy is its small size. This allows the user to bring the toy anywhere he likes,and play with it anywhere and anytime thus, its such a successful toy. Furthermore, the design of the toy allows it to be able to be played by anyone of any age. It is a simple toy, but can be used to make many tricks thus, it is welcomed by users of all age

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For my toy design i've chose  a yoyo, the reason behind this decision is because it is one of my childhood toys. It caught my attention as yoyo's come in many cool designs, and is a very unique and fun toy that brings people together. It is worth the analysis because despite, it just being a simple toy that can be easily made, it can be used to make a lot of tricks and has more benefits that meet the eye.

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However, the yoyo of course have its own disadvantages as a toy.
1) After playing for awhile sometimes the string will get tangled up
2) Sometimes when playing the user might not be aware of his surroundings and injure someone when playing.

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Firstly, the yoyo can come is all shape and sizes, all sorts of design and can be made with many different materials.There are yoyo's made of metal, plastics ones and even yoyo's made of wood.