Your search for "packaging materials" revealed the following:
SS-600-6 – Stainless Steel Swagelok Tube Fitting Union, 3/8 in. Tube OD, 316 SS
S$22.69
Vendor: APSS Store
View Product
SS-400-6 – Stainless Steel Swagelok Tube Fitting Union, 1/4 in. Tube OD, 316 SS
S$15.98
Vendor: APSS Store
View Product