From Amazon
Original Einhell Staples for Cordless Nailers (Cordless Nailer/Stapler Accessories, 3,000 Pieces, 5.7 x 19 mm, Suitable for Einhell Cordless Nailer TE-CN 18 Li-Solo)
Conrad Electronic
Einhell 4137875 Narrow crown 3000 pc(s) Dimensions (L x W) 19 mm x 5.7 mm