Kwila cube - should I oil them or just leave as?

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here are some pics of the Kwila cube I made before, was wondering what finishing product should I use? oil? stain? what would be the best for Kwila? this is to be used indoor.

Thanks for your input?

Attached Images

• Screen Shot 2015-06-25 at 4.41.34 pm.jpg (161.1 KB)
• Screen Shot 2015-06-25 at 4.42.04 pm.jpg (101.0 KB)
• Screen Shot 2015-06-25 at 4.42.14 pm.jpg (119.8 KB)
• Screen Shot 2015-06-25 at 4.42.28 pm.jpg (106.4 KB)
• Screen Shot 2015-06-25 at 4.42.41 pm.jpg (82.4 KB)
• Screen Shot 2015-06-25 at 4.42.59 pm.jpg (96.5 KB)
• Screen Shot 2015-06-25 at 4.51.00 pm.jpg (68.7 KB)