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煅燒阿爾法氧化鋁粉等材料為原料，經過配料、研磨、制粉（制漿、制泥）、成型、干燥、燒成等工序制作而成的，主要作為研磨介質而被廣泛使用的球石。根據不同的氧化鋁含量，可以分為中鋁球、中高鋁球和高鋁球。 　　
一般把60%—65%氧化鋁含量的劃為中鋁球，75%—80%氧化鋁含量的稱為中高鋁球，90%以上氧化鋁含量的為高鋁球。其中高鋁球又細分為90瓷、92瓷、95瓷和99瓷。99瓷由于其極高的生產成本而很少有大型廠家大批量制造，目前主要為部分特種陶瓷廠通過手工制作。 　　
中鋁球和中高鋁球由于其較低的價格，而被大部分陶瓷廠所接受，主要用于研磨陶瓷坯料。高鋁球由于其具有高強度、高硬度、高耐磨性，比重大、體積小、耐高溫、耐腐蝕、無污染等優異特性而被廣泛的運用于不同類型的陶瓷、瓷釉、玻璃、化工等等工廠的厚硬材質精加工和深加工，其中尤以92含量的高鋁球使用為普遍。（圖/文m.jiacaiys.com）
中譯英：
The roll should be cleaned after use, use plastic film to colloidal packets together, on the roller frame, must not be a casual stacked in a vertical or conveniently on side wall, so as to allow the gel to get not due loss. Waste rubber processing casting them in the transportation process, avoid abandonment pressure or weight of chaos, to maintain the roll core not partial core, do not bend, in order to ensure the normal use of the roller core.

Rotary cutting machine general large volume and complicated in structure, the former need log centering, if centering not, began peeling will spin out the intermittent veneer strips or narrow single board. Cots with metal or other material as core, rubber covered by vulcanization and made of roller products. New casting roller is not immediately put into use.