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When you skidding at night,it is easy to occur accident. So ,put the fluorescent powder in the pile of the skidding wheel. The powder can stockpile luminous energy when it was irradiated by nature light,sunshine,lamp light ,ultraviolet light and so on. So you can find that it is shining at night or in dim areas for the luminous energy will be released in the way of fluorescent light. Besides ,the skidding is made by soft silica gel instead of rigid silica gel in case of hurting people and makes it be infinite interesting .
Liu Chenming Shi Ran Fu Lin Xu Qiuying