YD-2 series for the optional parts, is made of titanium socket screw set. 78 bottles.

Titanium button head socket screw / Titanium BH Socket Screw 
3 × 5Mm 2 This 
3 × 6mm 6 This 
3 × 8mm 1 This 
3 × 10mm 20 This 
3 × 12mm 8 This 
3 × 35mm 3 this

Titanium flat head socket screw / Titanium FH Socket Screw 
3 × 8Mm 11 This 
3 × 10mm 14 This 
3 × 12mm 7 This 
3 × 15mm 2 This 
3 × 18mm 4 this