Rollerblade Pro X Inline Skate Replacement Laces. These will naturally also will fit other like models other than the Pro X they are made for.
They come in just one size (68.9"; 175cm) and one color. The price is for a pair of laces.

Custom Skates for Relaxed Skating Experience-Rollerblade Pro X Replacement Laces (1set/pair) - Black
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