label.m Twisted U-Pin Black 50mm (Pack of 40) Information Reviews The label.m Twisted U-Pin 50mm (pack of 40) in black is our version of the classic U-Pin. These pins are very strong, making them perfect for working with thick coarse hair. Available in 50mm and 70mm. No reviews yet – you can leave a review and rate this product after purchase. £3.95 Sorry, product is not in stock at the moment. Tweet