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Add some classy design, DIY flair and a damn cool pair of bookshelf speakers to your home with Cinder Speakers. Designed by Daniel Ballou (who was also responsible for those desktop ceramic cargo containers) to leverage the low resonance and vibration reducing properties of concrete without having to worry about its weight and lack of portability, Cinder Speakers turn any cinder blocks into speakers worthy of display. The system uses a front and rear fascia that’s pre-wired, pre-assembled and sandwiches your cinder blocks inside with bolts. The front of the speaker includes a 5” driver, tweeter, crossover and input jack while the back seals the enclosure. Cinder Speakers are in the fine-tuning stage, so you still have some time to find some free cinder blocks.

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When it comes to dress shoes, you used to be limited to affordable or well made. That’s a thing of the past with Ace Marks because they’re dedicated to making luxury dress shoes more accessible. By cutting out the middle man and all those big retail mark-ups, Ace Marks is able to bring you a $600 quality dress shoe that’s stylish and professional for under $300. Ace Marks is making the deal even better by giving you an extra $15 off each pair and free domestic shipping with code COOLMATERIAL until December 20th.