do you need a hub to add 2 of these together with case fans to use aura sync ?

each strip has a pigtail on both ends to daisy chain them together, hub is not necessary. one will plug to your 5v addressable rgb header on your mobo and then you just daisy chaing them.

13.5 inches led to led ends and 16.5 inches between the end plugs

can these be cut to length or not without messing them up?

Hello Charles Moye, Thank you for contacting us in regards to your question. This item appears that you are not able to cut into lengths, it is just a very long strip. Thank you, Newegg Support

Questions & Answers: Extended Computer Magnetic 5V 3 Pin LED Strip - 2PCS RGB LED Strip Light for ASUS AURA SYNC / MSI Mystic Sync / ASROCK AURA RGB / GIGABYTE RGB Fusion (5V 3 Pin addressable LED headers ONLY)

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Extended Computer Magnetic 5V 3 Pin LED Strip - 2PCS RGB LED Strip Light for ASUS AURA SYNC / MSI Mystic Sync / ASROCK AURA RGB / GIGABYTE RGB Fusion (5V 3 Pin addressable LED headers ONLY)

DESIGNED FOR MOTHERBOARD WITH 3PIN DRGB LED STRIP HEADER : Compatible with ASUS AURA SYNC (5V 3pin) / MSI Mystic Light Sync (5V 3pin) / ASROCK AURA RGB (5V 3pin)/ GIGABYTE RGB Fusion(5V 3pin), Motherboards with 3 pin DRGB Header (+5V,DATA,N/A,GND), not for 4pin RGB LED header (+12V, G,R,B).
Synchronised control via 5V Addressable RGB header on M/B. : Can be easily controlled by 5V ADD-RGB Header on M/B (3pin), no additional controller needed, and can synchronize with other ADD-RGB devices. (Only 5V RGB addressable lighting headers from compatible motherboards are supported; please do not connect the strip to a 12V connector)
5V Addressable RGB 5050 LED longing strip: Made with 15 Addressable RGB LEDs to meet the multiple color effect lighting
Also fit for anidees AI-AUREOLA Fan Hub(optional) : AI AUREOLA Fan Hub is designed to connect anidees AR Fan and LED Strips, synchronize the lighting effects by RF Controller.
Magnetic Backing and Adhesive(3M) Strips for universal mounting options

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