cheap wholesale sterling jewelry Is Bitcoin's delivery contract better or sustainable contract?

wholesale designer jewelry china There is a date of delivery of the delivery contract, which needs to be delivered on the designated date. At present, there are weekly delivery and quarterly delivery. The expiration will be forced to deliver. If you do not want to be forced to delivery, you need to close the position before the delivery date. On the time of the delivery time period, the delivery time period should be performed. Inside, you cannot trade.
The biggest feature of the perpetual contract is that there is no delivery date. Users can hold positions indefinitely or trading anytime, anywhere. Essence
In comprehensive, it is better to choose a sustainable contract.

jewelry carry cases wholesale I am more preferred to play forever contract, province's stare.