可以单独售卖，也可以一起购买7只。包装小巧玲珑，设计精巧，更适合儿童。银色纯净，如高山白雪，清冷圣洁。

You can sell them alone, or you can sell them all together. Small and exquisite design, more suitable for children. The tone is pure, like the snow on the high mountain, cool and holy.