Hi @scat! Thanks for your feedback
I understand what you mean with your comment, but keep in mind that the arrows could fit with lots of ideas and services. e.g: chats, file uploading services, exchanges and many many more...
Specifically what you do while you chat is exchange messages   definitely, it's a multi-purpose chat.

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Jus as an example, here you have other designers creations with the same idea applied (send and receive) with arrows:

Designer: Venimo - http://www.dreamstime.com/stock-photography-send-receive-image12267092


Designer: Saki - http://www.iconarchive.com/show/nuoveXT-2-icons-by-saki/Mail-send-receive-icon.html


Designer: Linuxerist - https://commons.wikimedia.org/wiki/File:Mail-send-receive.svg


Beta Mail - http://www.iconshock.com/icons/beta/mail_icons/send_receive-icon.html

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Thanks another time for your comment @scat! It's always good to receive other users feedback.
To the OP: graphics are fully customizable and can change depending on your needs  

Have a nice weekend, guys!