Biloba Sand Timer provides an optimal time frame for work and rest. | Made By high borosilicate glass ,100% hand-blown made clear glass .Correct minute works control of quality.3 minutes - Black color. 5 minutes - Copper color. 30 minutes - Creamy White color, ,Cocoa color,Copper color. 60 minutes - Cocoa color,Gold color | It is both a work of art and a useful tool. Inspirited designer grand glass. 100% customer satisfy and quality guarantee. | Give a gift - For your Home ,Office , Desk, Science and Education. Makes a thoughtful gift for any occasion. | Free replacement if any shipping broken - Send info's to our customer service team and all shipping issue will be soon solved.

Made By high borosilicate glass ,100% hand-blown made clear glass . | Correct minute works control of quality.3 minutes - Black color. 5 minutes - Copper color. 30 minutes - Creamy White color, ,Cocoa color，Copper color. 60 minutes - Cocoa color，Gold color. | It is both a work of art and a useful tool. Inspirited designer grand glass . 100% customer satisfy and quality guarantee. | Give a gift - For your Home ,Office , Desk, Science and Education. Makes a thoughtful gift for any occasion. | Free replacement if any shipping broken - Send info's to our customer service team and all shipping issue will be soon solved.

The hourglass is made of high borosilicate glass ,transparent and clear, 100% hand-blown, so the hourglass can not used to measure time accurately.The standard error range is +-6s/mins. 3minues(2mins42s -3mins18s) 5mins(4mins30s-5mins30s) 30mins(27mins-33mins) 60mins(54mins-66mins). | There are many choices for your choosing,3 minutes-Black,5 minutes-Copper,30 minutes-White,Dark Browm,Black Beauty and Sunburn,60 minutes-Cocoa,Gold and Pirate Black. | The hourglass sand timer is both a work of art and a useful tool for your life. Perfect to help manage work and break times easily, and make it much easier to cultivate children's sense of time. | Great gift for your Home or Office. Innovative decorations on your Desk. Useful tool for Science and Education. | Warranty - Send info's to our customer service team if any hourglass was damaged during shipping.The issue will be solved as soon as possible.