... .8cm 5. OEM service stainless steel sand timer, 1. Holder material: stainless steel, glass sand, PP tube2. Products weight: 135grams3. sand glass size: 9 x ... 3 minutes, green sand for 4 minutes, yellow sand for 5 minutes5. regular colour: Orange, red, yellow, blue and green More information ... .2.Factors affecting the time include the amount of sand,the bulb size,the neck width,and the sand quality