the difference of this series of double wall glass is that they're stackable. Save space. 

the advantage of double wall glass cup is it's thermal barrier effect. You can hold one cup of hot coffee or ice-cream without feeling of hot or cold. 

this series of double wall glass cup includes 90ml, 150ml, 250ml, 350ml and 450ml.  Customized size or design is acceptable. Mould charges will be refund to you when you place order. 

Sample making cost is free. You can just undertake the shipping cost from China to your local. 

Borosilicate material is food grade. We have SGS certificates.  and we export several containers to European market each month.