I purchased these for sound research, but I haven't used them much, so I hope someone who will use them will consider buying them. Canopus Backbeat 42-strand 14" Backbeat 20-strand 14" Vintage NP 20-strand 13" PureSound Custom Pro 20-strand 13" with tape Blaster 12" Each is one piece. There is no severe warping, but these are used items. Please refrain from purchasing if you are overly concerned about condition. Non-smoking, no pets, and stored indoors. Immediate purchase is welcome. I have tried to set the price to be affordable considering the market price, but if you would like to negotiate a discount, please use the discount request feature instead of commenting. No returns accepted.