Safe rounded edges on all the bars and on the frame. The wood frame is very sturdy; the bars are attached to the frame by rubber pegs and can be carefully removed (but they are not easy to remove). The use of black and white bars in the same manner as on a piano makes it easy to recognize the notes. Each bar is 1.19 wide. Dimensions approximately 9.25 wide (at the widest end) x 15.75 long x 1.75 high.