Compared to machine wefts the hand tied is more durable and lasts longer. Generally they are more secure than machine made because the stitching can be made tighter by hand. They keep their shape making installs easier and faster with very litle shedding.But it is more expensive than machine made weft. It takes same time as machine made weft to do hand tied weft which is about 10~12 days. you may do rush order which is around one week.it comes in 4oz or 100g per bundle.