I can also make these custom lengths and can make them with male connectors both ends if needed (see photo two).
eBay
The 3.5mm Jack Male Mini Stereo to 2 Dual Female RCA Twin Phono Cable Lead is a versatile audio adapter suitable for connecting various devices with a 3.5mm jack and RCA/phono connectors. This simplex fibre cable with a length of 50cm is designed for easy connection and duplication of audio signals, making it ideal for use with PCs, TVs, and other audio equipment. The black cable with a gauge of 20 AWG is shielded and portable, ensuring high-quality sound transmission and durability. With a manufacturer warranty of 2 years, this unit by pluX is a reliable choice for your audio setup.
eBay
Essager RCA Audio Cable 3.5mm Stereo Jack to 2RCA Phono. 3.5mm to 2 RCA cable enables you to connect an iPhone/iPad, MP3 player, smartphone or laptop with the 3.5mm Jack to Stereo Receiver, Amplifier, Speaker with 2RCA Devices.
eBay
3.5mm stereo jack socket to 2 x rca phono plugs. Good quality cable with fully rounded phono connectors. 3.5mm Mini Stereo Jack Socket to Twin RCA. 3.5mm Female to 2 x RCA Male. This will convert a stereo signal to two left and right mono channels.
eBay
RCA Phono Extension Cables. RCA Phono Male to Male. RCA Phono Adapters. Connector B: 2 x RCA Phono Male. 3.5mm to 2 x RCA Cables. 3.5mm Female Jack to RCA Converter. 4 pole 3.5mm. 6.35mm 1/4" Jack Mono Cables.
eBay
RCA PHONO SPLITTER CABLE LEAD 2 x FEMALE TO 1 x MALE. 2X 30cm RCA Phono Y Splitter Adapter Cable Lead 1 Male to 2 Female Car Audio Mic. 2pcs x RCA Audio Splitter Cable. 1 Male to 2 Female. Outstanding noise rejection, accuracy, and frequency response to contribute to excellent sound quality.
eBay
Tough, flexible and very easy to prepare as the foil screen is bonded to the outer jacket, this cable type is also useful for ‘bodge leads’, adaptor cables and multipin breakouts where individual tails need to be colour identified or are to be permanently installed.
eBay
1 x RCA Phono Female Socket to 2 x RCA Phono Male Plugs. PRO RCA PHONO SPLITTER. Pro RCA Phono Y Splitter Cable Adapter. RCA Phono Splitter. Double Shielded High Definition OFC Cable.
eBay