The 1724050001 from Weidmuller is a white slip-on polyamide (PA, nylon) wire marker measuring 0.16" W x 0.47" L (4.0 mm x 12.0 mm), sold as a pack of 400.
The 1724050004 from Weidmuller is a yellow slip-on wire marker measuring 0.16" W x 0.47" L (4.0 mm x 12.0 mm), made of polyamide (PA) nylon, sold in boxes of 400.