Initial torque required is more for heavier glasse s. After it starts moving then it will be easy to move. But in fenestration industry “smoothness” does not have any specific definition.
We have some specific colours which we usually keep in stock. Apart from these colour if any customer wants any specific colour then time of procurement and cost will come into picture.
Slim windows are usually preferred where client needs to enjoy outside environment. Also if they want very minimal sections in between. Selection majorly depends on size, design, specific requirement and budget.